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REVIEW 4 major objections 6 minor 21 references

Temperature Dependent Optical Response Of High- Tc Yba2cu3o7-{\delta} (Ybco) Thin Films

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Pith's one-line read Visible light detects the superconducting transition of a 100 nm YBCO film: transmittance rises 35-41% as the film cools through its critical temperature.

desk verdict New multiwavelength transmittance data on YBCO through Tc, but the superconducting origin of the signal is not yet nailed down; deserves peer review with major revision. read the letter →

arxiv 2507.07866 v1 pith:NHEANWGZ submitted 2025-07-10 cond-mat.supr-con

Vivek Khichar , V. A. Chirayath , Jonathan Asaadi , Nader Hozhabri , Benjamin J. P. Jones , Ali R. Koymen , Iakovos Tzoka , Pratyanik Sau This is my paper · ORCID
classification cond-mat.supr-con
keywords YBCOthinfilmshigh-temperaturesuperconductorsopticaltransmittancetwo-fluidmodelcriticaltemperaturemeasurementcryogenicspectroscopynon-contactTcreadoutvisible
verification ladder T0 review T1 audit T2 compute T3 formal

The pith

A machine-rendered reading of the paper's core claim, the machinery that carries it, and where it could break.

The reading

The paper tries to establish that the superconducting transition of a high-temperature superconductor can be seen in ordinary visible light without electrical contacts. Cooling a 100 nm YBCO film on strontium titanate raises its transmittance by 35-41% relative to room temperature and lowers its reflectance, with the change starting near 100 K and saturating near 70 K. Logistic midpoints of the transmittance curves give optical Tc values of 80-88 K, consistent with the 87±3 K obtained from resistivity. If correct, this makes transmittance a practical non-contact thermometer for Tc in thin films, and a two-fluid model with a photon-coupling term accounts for the observed wavelength dependence.

What carries the argument

The argument is carried by the two-fluid dielectric response of the film: charge carriers are split into a normal-fluid density $n_n$ and a condensate density $n_s$, and the effective permittivity is written so that absorption enters through $n_n(T,\hbar\omega)$. The paper adapts an empirical microwave-frequency permittivity model by removing microwave-specific approximations and adding a coupling factor $\beta(\hbar\omega)=1-e^{-E_{\rm gap}/\kappa\hbar\omega}$, which weakens the condensate's contribution when photon energy grows. The resulting complex refractive index is put into multilayer transmittance equations to produce the predicted transmittance-versus-temperature curves. On the data side, the load-bearing operation is a logistic fit to the transmittance and reflectance curves whose midpoint defines the optical Tc.

What would settle it

Repeat the wavelength-dependent transmittance sweeps on a bare strontium titanate substrate and on an oxygen-depleted YBCO film with no superconducting transition; if either shows a comparable 35-41% transmittance rise between 100 K and 70 K, the optical signal is not uniquely tied to superconductivity.

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Extended reading notes

Core claim

The central claim is that 100 nm epitaxial YBCO films show a reproducible, wavelength-dependent optical response tied to the superconducting transition. At 633 nm, transmittance increases by up to 37% and reflectance falls by up to 76% while cooling through the transition; across 450-630 nm the transmittance change is 35-41%, largest near 580-633 nm and smallest at 450 nm. The midpoint of a logistic fit to transmittance gives Tc estimates between 80 and 88 K, while the resistivity midpoint is 87±3 K. The authors interpret the effect as the superconducting condensate reducing optical absorption, and a two-fluid model modified so that photons can convert some condensate back into normal carriers reproduces the temperature and wavelength trends. They conclude that the same optical signal could be used as a non-contact measurement of Tc in high-Tc thin films.

Load-bearing premise

The claims stand on the assumption that the rise in transmittance and fall in reflectance between about 100 K and 70 K come from the YBCO film entering the superconducting state, not from temperature-dependent changes in the substrate, the optical windows, or the film's oxygen content.

Editorial extensions

If this is right

  • A non-contact optical measurement can determine Tc of a high-Tc thin film from transmittance alone, with midpoint values between 80 and 88 K that agree with resistivity.
  • The optical transition begins near 100 K and saturates within a few kelvins below Tc, giving a sharp, reproducible optical fingerprint of the superconducting state in the visible band.
  • The magnitude of the transmittance change is wavelength dependent, largest near 580-633 nm and smallest near 450 nm, so the effect is not a simple broadband transparency change.
  • A two-fluid model with a photon-coupling term reproduces the temperature and wavelength dependence qualitatively, providing a physical story for why visible light can sense the transition.
  • Reflectance and transmittance both track the same transition, giving two independent optical handles on Tc.

Reading between the lines

Editorial extensions of the paper, not claims the author makes directly.

  • Beyond the paper, the same transmittance jump could be used to map Tc homogeneity across a film by imaging rather than spot-measuring, since the effect saturates within a few kelvins.
  • The paper's beta coupling predicts that the optical change should weaken as photon energy grows beyond the gap; measuring at shorter wavelengths would test whether the 35% floor at 450 nm becomes a sharp cutoff.
  • If the effect is confirmed, a single temperature-stabilized comparison above and below Tc could act as a fast optical superconducting-or-not readout, which would fit naturally into detector or sensor applications.
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Editorial analysis

A structured set of objections, weighed in public.

Desk editor's note, referee report, and a circularity audit.

Referee Report

4 major / 6 minor

Summary. The manuscript reports temperature-dependent transmittance and reflectance measurements of a 100 nm YBCO thin film on an STO substrate, covering 450 nm to 633 nm and temperatures from about 12 K to 300 K. The central observation is an increase in transmittance and a decrease in reflectance as the sample is cooled through the superconducting transition, with the optical change saturating a few kelvins below Tc. Logistic fits to the optical transmittance at several wavelengths give midpoint temperatures of 82-88 K, consistent with the resistive Tc of 87 ± 3 K. The authors propose a two-fluid model in which a photon-energy-dependent factor beta(hbar omega) depletes the superconducting fluid, yielding a qualitative account of the wavelength-dependent transmittance increase. The paper claims a non-contact optical route to determining Tc in high-Tc thin films.

Significance. If the observed optical changes are genuinely tied to the superconducting transition, the result would be useful for non-contact Tc diagnostics in thin-film superconductors, particularly for samples where electrical contacts are impractical. The manuscript has several strengths: simultaneous electrical and optical measurements on the same film, a substrate-only control at 633 nm, reproducibility between the 633 nm and 630 nm runs, and an explicit attempt to model the wavelength dependence. However, the significance is conditional on controls that are currently missing: the substrate control is not repeated at the other measured wavelengths, no non-superconducting YBCO or otherwise normal-state film is measured, and the film's oxygen content and Tc are not re-verified after the annealing step. The model also contains a hand-inserted wavelength dependence, so agreement with the data is partly circular. These gaps mean the central attribution to superconductivity is not yet established.

major comments (4)
  1. [Section IIB and Fig. 2 caption] The film's history undermines the attribution of the optical change to the superconducting transition. The manuscript reports that prior vacuum cycles reduced the oxygen content from YBa2Cu3O6.84 to YBa2Cu3O5.83 and that this reduced Tc, and that the sample was subsequently annealed in O2. However, no post-anneal EDS or post-run Tc verification is reported, so there is no direct evidence that the film measured in the optical runs was in the superconducting state with the claimed stoichiometry. Without this verification, temperature-dependent optical changes could reflect oxygen reordering or normal-state effects rather than the superconducting transition.
  2. [Section IIIC and Fig. 6] The substrate control is insufficient for the wavelength-dependent claims. The refractive-index-vs-temperature measurement of bare STO was performed only at 633 nm, yet Table I and Fig. 8 present transmittance changes at 450, 500, 530, 580, and 630 nm. STO has a band edge near 380 nm, and its refractive index and extinction coefficient can be temperature dependent at shorter wavelengths; even a small change in n would shift Fabry-Perot fringes in the 0.5 mm substrate and could mimic transmittance changes of the observed magnitude. A bare-STO control at each measured wavelength, or an estimate of the substrate-induced uncertainty, is required to support the claim that the changes are intrinsic to the YBCO film.
  3. [Section IV, Eqs. (5)-(6)] The model's wavelength dependence is inserted by hand, so the model's agreement with Table I is circular. The factor beta(hbar omega) = 1 - exp(-Egap / (kappa hbar omega)) in Eq. (6) is introduced specifically to make the superconducting fluid depletion depend on photon energy, and its parameters Egap and kappa are not independently determined. Likewise gamma, tau(Tc), alpha, lambda_L(0), n0, and mn are free or taken from unspecified sources. Consequently, the model does not independently predict the observed wavelength dependence; it restates the input. The authors acknowledge the model is qualitative, but the text should explicitly distinguish the fitted/inserted wavelength dependence from a predictive two-fluid derivation.
  4. [Section IIIB and Fig. 5] The reported 76% decrease in reflectance at 633 nm is surprisingly large for a visible-frequency two-fluid effect, since the condensate's Drude-like contribution at these photon energies is expected to be small. The manuscript does not measure the normal-state optical constants of the same film above Tc in a controlled way, nor does it provide a non-superconducting YBCO control (for example, an oxygen-deficient film with Tc below 10 K). As a result, the observed reflectance drop could also arise from temperature-dependent normal-state scattering, thermoreflectance, or stress-induced changes. The logistic-fit midpoint overlapping the resistive Tc is necessary but not sufficient, because any broad monotonic optical change in the same temperature window would produce a similar midpoint.
minor comments (6)
  1. [Section IIA] There is a typo in the third paragraph: 'weas' should be 'was'.
  2. [Section IV heading] The section heading reads 'DISICUSSION'; it should be 'DISCUSSION'.
  3. [Section IIB] The furnace manufacturer is spelled 'Linberg' in the text; the usual spelling is 'Lindberg'.
  4. [Table I and Abstract] The abstract and text state that the minimum transmittance change occurs at 450 nm, but Table I lists 36 ± 2% at 450 nm and 35 ± 2% at 500 nm. Within the stated uncertainties the values are equal, and the claim of a monotonic wavelength trend should be softened or reworded.
  5. [Section IIA and IIIB] The light sources are described as 'mixed polarized' without specifying the polarization state or its stability; since reflectance measurements are polarization sensitive, the manuscript should clarify how polarization affects the near-normal-incidence reflectance data.
  6. [Fig. 3 and Section IIIC] The beam-splitter correction fractions are stated to be valid specifically for 633 nm, but the variable-wavelength transmittance measurements in Section IIIC use only the window correction. The manuscript should either provide the beam-splitter wavelength dependence or explicitly justify why it does not enter the transmittance calculation at other wavelengths.

Circularity Check

1 steps flagged · score 4.0 of 10

Wavelength dependence in the two-fluid model is inserted by hand, not predicted; the core experimental observation remains independent.

  1. fitted input called prediction [Section IV, Eqs. (5)-(6), text accompanying Fig. 9]
    "As noted in Table I and Figure 9, the change in transmittance observed at Tc is wavelength dependent. Specifically, at 450 nm the difference between the measured transmittance values at 12 K and 300 K is approximately half that observed for 630 nm. We have empirically introduced this behavior into the model by hypothesizing that a small fraction of the incident photon energy couples to superconducting carriers, converting them back to normal carriers. ... β(ℏω) = 1 − e^{−Egap/(κℏω)}."

    The wavelength trend in the transmittance change is the experimental quantity to be explained. Equations (5)-(6) build that trend into the model through β(ℏω), with adjustable parameters Egap and κ; the paper explicitly says this behavior was 'empirically introduced' after seeing Table I and Fig. 9. No independent measurement or microscopic derivation fixes β(ℏω), so the model's later claim to 'predict' the observed wavelength-dependent transmittance is a restatement of the input, not an independent check. The experimental correlation between optical response and Tc is still independent; only this model explanation is circular.

full rationale

The primary experimental result, a reproducible increase in transmittance and decrease in reflectance near Tc, is self-contained and does not depend on the two-fluid model for its validity. The logistic-fit midpoints are direct summaries of the measured curves, not predictions from the model. However, the paper's theoretical account of the wavelength dependence is circular in a limited way: the β(ℏω) factor in Eqs. (5)-(6) is introduced empirically to reproduce the observed 450-630 nm trend in Table I and Fig. 9, and is then used to state that the model accounts for that same trend. The model is therefore an empirical parametrization, not an independent derivation. Other concerns (substrate control at only 633 nm, oxygen loss during vacuum cycling) are experimental limitations rather than circularity. No load-bearing self-citation chain is present.

Assumptions & free parameters 7 free parameters · 5 assumptions · 1 invented entities

The experimental observation rests on standard optical measurements plus a substrate control. The model portion rests on several unquantified material parameters (lambda_L(0), tau, gamma, alpha, n0, mn) and an ad hoc beta term that encodes the very wavelength dependence it is said to predict. The ledger shows the durable contribution is the data set; the explanation is underdetermined.

free parameters (7)
  • gamma (two-fluid temperature exponent)
    Appears in Eqs. (3) and (7). The paper states YBCO values between 1.2 and 2.5 but does not give the value used in the simulation.
  • tau(Tc) (normal carrier relaxation time at Tc)
    Required by the Drude terms in Eqs. (1)-(2) and defined in Eq. (4); no numerical value is reported.
  • alpha (residual-resistivity parameter)
    Empirical parameter in Eq. (4) controlling the relaxation time below Tc; no value is given.
  • Egap (gap energy scale in beta)
    Introduced in Eq. (6) to set the photon-energy dependence of the superfluid depletion; no value or independent estimate is given.
  • kappa (photon-superfluid coupling efficiency)
    Introduced in Eq. (6) as the efficiency with which photon energy couples to the superconducting fluid; no value is given.
  • lambda_L(0) (London penetration depth)
    Input to the superfluid term in Eq. (1); the paper provides no value and no citation for this material parameter.
  • n0 and mn (total fluid density and normal fluid effective mass)
    Enter the superfluid and Drude terms in Eqs. (1)-(2); no values are provided.
assumptions (5)
  • domain assumption Gorter-Casimir two-fluid model remains valid for YBCO at visible optical frequencies.
    The model basis [16,17] was developed for microwave and low-frequency response; the paper extends it to 450-633 nm by adding terms, without independent microscopic justification. (Section IV)
  • domain assumption The STO substrate contributes no temperature-dependent optical signal in the full 450-633 nm range.
    Only a 633 nm control measurement is shown (Fig. 6); the claim is extended to 450-630 nm. (Section IIIB)
  • domain assumption The YBCO film remained at superconducting stoichiometry with Tc near 87 K during the optical runs.
    Earlier vacuum cycles reduced oxygen content from 6.84 to 5.83; after annealing no EDS or resistivity verification is reported for the optical runs. (Section IIB)
  • ad hoc to paper Photon absorption converts superconducting fluid back to normal fluid with efficiency beta(hbar omega).
    Eqs. (5)-(6) postulate this mechanism specifically to reproduce the observed wavelength dependence; no derivation or independent evidence is provided. (Section IV)
  • standard math Standard multilayer transmittance formulas (Swanepoel [21]) describe the YBCO/STO stack.
    The model uses these formulas to convert optical constants into transmittance; this is established thin-film optics.
invented entities (1)
  • beta(hbar omega): photon-induced superfluid depletion factor
    purpose: Converts a fraction of the superconducting fluid into normal fluid at optical frequencies, creating the wavelength dependence of the transmittance change.
    The term is introduced after the wavelength trend was observed, with two unconstrained parameters (Egap and kappa) and no independent prediction or measurement. (Section IV, Eqs. (5)-(6))

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Pith. "Pith review of Temperature Dependent Optical Response Of High- Tc Yba2cu3o7-{\delta} (Ybco) Thin Films." pith.science (2026). https://pith.science/paper/NHEANWGZ

@misc{pith2026250707866,
  author       = {Pith},
  title        = {Pith review of: Temperature Dependent Optical Response Of High- Tc Yba2cu3o7-\delta (Ybco) Thin Films},
  year         = {2026},
  howpublished = {\url{https://pith.science/paper/NHEANWGZ}},
  note         = {Machine review of arXiv:2507.07866}
}
read the original abstract

We report on the temperature-dependent optical response of thin films of YBa2Cu3O7-{\delta} (YBCO) in the visible spectral range under cryogenic conditions. Specifically, we observe an increase in transmittance near the superconducting transition temperature (Tc), which saturates within a few kelvins below Tc. The increase in transmittance is accompanied by a corresponding decrease in reflectance as the temperature drops below Tc, and both quantities track the superconducting phase transition. Changes in transmittance are found to be wavelength dependent, with the maximum variation occurring at 633 nm and minimal at 450 nm. These observations establish a correlation between the variation in optical response and the superconducting phase transition, even in the visible regime. The results of our experiment highlight the potential for using non-contact optical measurements to determine Tc. The effect can be explained using the two-fluid model, which can account for the observed temperature and wavelength dependence of the transmittance of the superconducting thin films.

Figures

Figures reproduced from arXiv: 2507.07866 by the authors.

Figure 1
Figure 1. shows the schematic of our closed-cycle optical cryogenic apparatus capable of simultaneously measuring the optical response of the sample (reflectance and transmittance measurement) and its electrical properties (resistivity measurements) as a function of sample temperature [PITH_FULL_IMAGE:figures/full_fig_p005_1.png] view at source ↗
Figure 2
Figure 2. SEM and EDS scans of 100 nm YBCO thin film. [PITH_FULL_IMAGE:figures/full_fig_p008_2.png] view at source ↗
Figure 3
Figure 3. Schematic representation of all correction factors used in optical measurements. We note that the correction factors from the beam splitter is specifically for wavelength of λ ∼ 633 nm. III. EXPERIMENTAL RESULTS A. Determination of 𝑻𝒄 using resistivity measurements [PITH_FULL_IMAGE:figures/full_fig_p010_3.png] view at source ↗
Figures from the paper (8 more)
Figure 4
Figure 4. Figure 4: shows the measured normalized resistivity of the YBCO film as a function of sample temperature. The resistivity is normalized to the value at room temperature. The 𝑇𝑐 of the sample (obtained from an error weighted least squared fit with a logistic function which gave t…
Figure 5
Figure 5. Figure 5: a. Reflectance and b. transmittance of light from YBCO thin film as a function of sample temperature at near normal incident angle for laser wavelength of 𝜆~ 633 𝑛𝑚. Note: Error bars are enhanced for better visibility by a. three fold for reflectance and, b. two fold f…
Figure 6
Figure 6. Figure 6: Refractive index (n) of STO sample as a function of sample temperature for wavelength of 𝜆~ 633 𝑛𝑚, at normal incidence. The reflectance and transmittance data were fitted using a logistic function to extract the midpoint of the sigmoid, corresponding to the optical de…
Figure 7
Figure 7. Figure 7: Determination of the critical transition temperature of YBCO thin film sample using a. reflectance data and b. transmittance data. Blue circles with error bars show reflectance and transmittance data with solid red line showing fitted Logistic curve. As outlined previo…
Figure 8
Figure 8. Figure 8: Transmittance of light from YBCO thin film sample as a function of sample temperature at various wavelengths. A variable wavelength laser, at normal incidence, was used as the light source. Note: Error bars are enhanced by five fold for better visibility. We measured t…
Figure 9
Figure 9. Figure 9: Change in transmittance (Δ(Tr)) across the superconducting transition as a function of wavelength. Δ(Tr) is the difference between the transmittance measured at 12 K and that measured at 300 K. To take into account the conversion of the superconducting fluid to a norma…
Figure 10
Figure 10. Figure 10: Variation of normal and superconducting current density as a function of temperature for [PITH_FULL_IMAGE:figures/full_fig_p021_10.png]
Figure 11
Figure 11. Figure 11: Transmittance as a function of temperature for various wavelengths simulated using the [PITH_FULL_IMAGE:figures/full_fig_p022_11.png]

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