Evidence for superconductivity at 190 K in a pressure-overdoped cuprate

Adam Denchfield; Alexander C. Mark; Daniel P. Phelan; David Rodriguez; D. Gonzalez Arevalo; Eduardo H.T. Poldi; Huu T. Do; N. K. Man; Russell J. Hemley

REVIEW 3 major objections 5 minor 67 references

Evidence for superconductivity at 190 K in a pressure-overdoped cuprate

T0 review · 3 major / 5 minor · reviewed 2026-08-06 · deepseek-v4-flash

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Pith's one-line read The paper claims quasihydrostatic pressure raises the superconducting critical temperature of Bi-2223 to 190 K at 60 GPa, the highest reported for cuprates, by entering a second high-doping superconducting regime.

desk verdict Bi-2223 at 60 GPa: plausible but unconfirmed 190 K, with the weakest evidence exactly at the record point. read the letter →

arxiv 2608.00942 v2 pith:YT4CPOS7 submitted 2026-08-02 cond-mat.supr-con

Alexander C. Mark , Huu T. Do , David Rodriguez , D. Gonzalez Arevalo , Adam Denchfield , Eduardo H.T. Poldi , Daniel P. Phelan , N. K. Man

show 1 more author

Russell J. Hemley

This is my paper · ORCID

classification cond-mat.supr-con

keywords cupratesuperconductivityBi-2223highpressureMeissnereffectdiamondanvilcelloverdopedcupratessecondsuperconductingdomeLifshitztransition

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

Using three complementary probes of the Meissner effect inside a diamond anvil cell, this paper follows the superconducting transition of the trilayer cuprate Pb0.4Bi1.6Sr2Ca2Cu3O10+δ (Bi-2223) up to 60 GPa. It reports that samples compressed under quasihydrostatic conditions first show the familiar non-monotonic dome in $T_c$ below 25 GPa and then a continuous rise to 190 K at 60 GPa, which the authors take to be the highest critical temperature reported for any cuprate. The proposed explanation is that pressure decouples hole doping from chemical oxygen doping, driving the material into a highly overdoped regime where a Fermi-surface Lifshitz transition supports a second superconducting dome. If correct, this would extend the cuprate phase diagram far beyond the ambient-pressure dome and make pressure a route to higher-$T_c$ superconductivity in this family.

What carries the argument

The load-bearing mechanism is pressure-induced hole doping: compression transfers charge out of the CuO2 planes into the charge-reservoir layers, increasing the hole concentration $n_H$ per plane while oxygen content stays fixed. The paper argues this decoupling lets $n_H$ reach about 0.52 at 60 GPa, driving a Lifshitz transition (the $d_{3z^2-r^2}$ band crossing the Fermi level) and a second superconducting dome. The quasihydrostatic 20/80 Bi-2223/KCl environment is the experimental condition that preserves this state; the double-modulated AC susceptibility is the measurement technique that resolves the 190 K onset.

What would settle it

Field-cooled magnetization or magnetic flux imaging of Bi-2223 at 60 GPa in a noble-gas pressure medium (Ne or He) would settle it: if no diamagnetic flux expulsion appears near 190 K, or if x-ray diffraction at 60 GPa shows a structural phase change, decomposition, or strong deviatoric broadening, then the 190 K signal is not a bulk superconducting transition.

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Extended reading notes

Core claim

In the paper's own terms, the discovery is evidence that Bi-2223 under quasihydrostatic pressure enters a second superconducting regime at high hole doping, with the Meissner onset rising from a minimum near 25 GPa to 190 K at 60 GPa. The claim rests on three detection techniques—AC susceptibility, double-modulated susceptibility, and RF susceptibility—all measuring the onset of magnetic field expulsion. Samples in a more hydrostatic 20/80 Bi-2223/KCl mixture show the rise, while a stiffer 50/50 mixture suppresses $T_c$ above 30 GPa, which the authors attribute to deviatoric stress. DFT calculations using experimentally measured lattice parameters put the effective hole doping near $n_H \app

Load-bearing premise

The whole result depends on the assumption that the 20/80 Bi-2223/KCl mixture stays sufficiently quasihydrostatic at 60 GPa for the 190 K signal to be a genuine bulk Meissner transition rather than an artifact of stress gradients, sample damage, or background; the paper itself notes that at 39 GPa stress gradients begin to split the transition and that the stiffer 50/50 mixture suppresses Tc above 30 GPa.

Editorial extensions

If this is right

Cuprate superconductivity is not bounded by the ambient-pressure parabolic dome: pressure can push $T_c$ past 190 K in a trilayer cuprate.
The previously conflicting $T_c(P)$ reports for Bi-2223 are explained as a competition between quasihydrostatic and non-hydrostatic compression environments.
Pressure can substitute for oxygen doping to explore hole concentrations $n_H > 0.3$ that are nearly inaccessible in bulk synthesis.
If a Lifshitz transition is the cause, the high-pressure state should show a change in Fermi-surface topology and pairing symmetry relative to ambient-pressure Bi-2223.
The second-dome picture implies a finite pressure window: $T_c$ may continue rising beyond 60 GPa, or eventually turn over as the dome is crossed.

Reading between the lines

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

A direct test that goes beyond the paper: perform field-cooled and zero-field-cooled magnetization on a single crystal of Bi-2223 in a noble-gas medium at 60 GPa; bulk flux expulsion near 190 K would rule out stress-gradient artifacts.
The 20/80 vs 50/50 KCl contrast suggests a tunable experimental knob: varying the KCl fraction at fixed pressure should sweep $T_c$ continuously if non-hydrostatic stress is the suppressor, or leave it unchanged if chemistry or grain size matters.
If the second dome is real, analogous pressure-doping experiments on Bi-2212 and Bi-2201 should reveal similar upturns at higher pressures, since the same Lifshitz argument has been made for those compounds.
The pressure-quench idea proposed in the literature for retaining high $T_c$ at ambient pressure could be transferred to Bi-2223: synthesize in the 190 K state at 60 GPa, then rapidly decompress and test for metastable retention.

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Editorial analysis

A structured set of objections, weighed in public.

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

Desk Editor's Note

read the letter

Short version: this is a careful high-pressure study with a load-bearing weak spot at the very top. The paper extends T_c measurements on Bi-2223 from 40 GPa to 60 GPa and reports 190 K, which would beat the old cuprate record by roughly 26 K. That is a big deal if true. But the 190 K point is exactly where the evidence gets thinnest.

What's genuinely good: the low-pressure data agree with Chen et al. and with their own methanol/ethanol runs; the comparison between 20/80 and 50/50 KCl mixtures makes a clean case that hydrostaticity matters; and they used three different probes. They are candid about the known artifacts in the double-modulation technique in Methods, and the DFT section is appropriately hedged as qualitative. The data repository is a real plus.

Now the soft spot, and it's in the right place: the record claim. The 190 K point comes from a single double-modulation phase-angle feature at 60 GPa. No error bars, no replicate runs shown, and no RF trace at that pressure; the RF data are described as systematically 2–5 K lower, but no 60 GPa value is displayed. Meanwhile, at 39 GPa the standard AC susceptibility already shows multiple features that the authors attribute to stress gradients, and the 50/50 mixture kills the T_c rise above 30 GPa. The Methods section explicitly lists overtones and nonlinearities as instrumental artifacts in the recovered signals. So the highest-pressure point sits in the regime where the technique is least reliable and the pressure environment is least characterized. That does not mean the signal is false, but it means the abstract's 'climbs continuously to 190 K' is ahead of the evidence shown.

I'd still send this to a serious referee. The question is important, the experiment is hard, and the authors are not hiding their limitations. The referee should ask for the raw data behind Fig. 4a, a replicate at 60 GPa, and a direct RF or AC sweep at that pressure. Until then, treat 190 K as promising but unverified. I would cite it as 'reported' in a review, but I wouldn't build anything on it yet.

Referee Report

3 major / 5 minor

Summary. The paper reports measurements of the superconducting critical temperature of Pb-substituted Bi-2223 under quasihydrostatic pressure to 60 GPa, using three inductive methods: AC susceptibility, a double-modulation technique, and RF susceptibility. Below 25 GPa the data reproduce earlier non-monotonic pressure dependencies. The central claim is that above this regime T_c rises continuously to 190 K at 60 GPa, which would be the highest T_c reported for cuprates at any pressure. The authors interpret this as evidence for a second superconducting dome at high hole doping, supported by qualitative DFT-PBE estimates of pressure-induced hole doping and by prior proposals of a Lifshitz transition.

Significance. If substantiated, the claim is important: it would establish a new pressure record for cuprate superconductivity, with direct bearing on the phase diagram of overdoped cuprates and on proposals for a second pairing dome. The paper's strengths include the use of multiple independent probes over most of the pressure range, careful comparison with prior data in different compression media, and a data-availability statement. The DFT calculations are explicitly framed as qualitative. However, the headline 190 K result rests on a single inductive-channel feature at the highest pressure, with no error bars, no shown corroborating technique at that pressure, and unverified quasihydrostaticity. These gaps are load-bearing for the record claim.

major comments (3)

[§III, Fig. 4a; §II.B] The 190 K point rests on the double-modulation phase-angle feature at 60 GPa. The Methods paragraph explicitly acknowledges 'instrumental artifacts are apparent in the recovered signals due to nonlinearities in the circuitry, induced background magnetic response, and the appearance of overtones and oscillations at multiples of the driving frequency,' and the Fig. 4a caption states that 'Oscillations in measurements are instrumental and due to overtones of the driving frequencies.' No error bar, no directly shown |V_mod(T)| trace at 60 GPa, and no RF/AC corroboration at 60 GPa are provided. Given that the RF technique is described as systematically lower by 2-5 K, the reader cannot exclude that the 60 GPa feature is an overtone or background artifact. This issue is central to the abstract's claim.
[§III, Figs. 2 and 3; §II.A] The claim that 20/80 Bi-2223/KCl remains sufficiently quasihydrostatic at 60 GPa is unverified. The paper itself attributes the multiple features at 39 GPa (Fig. 2a) to 'pressure gradients developing across the sample,' and shows that the less-hydrostatic 50/50 mixture suppresses T_c above 30 GPa (Fig. 3). No pressure-medium characterization at 60 GPa (e.g., ruby linewidth, diamond Raman stress signature, or x-ray stress analysis) is reported for the actual sample environment. The possibility that deviatoric stress or sample degradation contributes to or suppresses the observed 60 GPa feature is not excluded.
[§III, Fig. 5; §IV] No estimate of uncertainty is given for the 190 K point. The number of independent runs, DAC loads, and sample batches used to establish this point is not stated, and no error bars appear in Fig. 5. In addition, no quantitative Meissner fraction or diamagnetic signal magnitude is reported. For a record claim exceeding all previous cuprate T_c values, a single un-replicated feature without stated measurement uncertainty is insufficient. The authors should provide replicate data and quantify the uncertainty in T_c and pressure, or temper the abstract's categorical statement.

minor comments (5)

[Abstract] The sentence 'Evidence for critical temperatures exceeding those reported to date for cuprates at ambient and high pressures, the results may be understood...' is grammatically incomplete. It should be rephrased, e.g., 'The results provide evidence for... and may be understood...'
[§II.B] Instrument model numbers are written as 'SRS 860' and 'SRS 844'; the commercial prefixes are 'SR860' and 'SR844.' Please confirm the model designations.
[Fig. 4b] The caption states that 'instrumental noise apparent in the 6 GPa dataset removed at 125 K - 150 K for clarity.' Removing data over such a wide interval can bias the appearance of a transition; please justify this removal or show the raw trace.
[Fig. 5 inset] The inset legend uses the same green open circles for both the 50/50 data and 'previous data in various media labeled nonhydrostatic.' This is confusing; please distinguish the datasets with distinct symbols or labels.
[§IV, Fig. 6] The DFT-PBE estimate n_H ≈ 0.52 is presented as a single value without sensitivity to pseudopotential or k-mesh choices. Since the authors correctly state that DFT-PBE is inadequate for quantitative cuprate electronic structure, this value should be labeled as illustrative, not as a quantitative prediction.

Circularity Check

0 steps flagged · score 2.0 of 10

No significant circularity: the 190 K claim is an independent measurement; self-citations are technical and not load-bearing.

full rationale

The central claim is an empirical measurement of the Meissner onset in Bi-2223 under pressure. T_c is assigned from AC susceptibility, double-modulation, and RF signatures using the criteria of Chen et al. (2010), an external pre-existing procedure; it is not derived from an equation fitted to the new data. Eq. (2) (the Presland-Tallon parabola) is used only for post hoc comparison and to contextualize the estimated hole doping; no parameter of Eq. (2) is fitted to the 190 K point. The DFT-PBE calculations use experimental lattice parameters to estimate pressure-driven charge transfer (n_H≈0.52), but this is explicitly presented as a qualitative trend and is not used to predict or constrain the measured T_c values. Self-citations (Refs. 4, 8, 15, 29–33) support the measurement technique, prior structural data, and review context; they are ancillary to the record claim. The paper itself flags limitations—instrumental overtones in the double-modulation signals (Methods and Fig. 4a caption), multiple features at 39 GPa attributed to stress gradients, and suppression of T_c in the less-hydrostatic 50/50 KCl mixture. These are data-reliability and hydrostaticity concerns, not circular reasoning. No fitted input is renamed as a prediction, and no uniqueness theorem is imported from the authors' prior work. The derivation chain is self-contained against external benchmarks, so the circularity score is low.

Assumptions & free parameters 1 free parameters · 3 assumptions · 0 invented entities

No free parameters are fitted to produce the 190 K claim; delta is a sample characterization. The central claim relies on the hydrostaticity and Meissner-effect interpretations, which are domain assumptions. No new entities are introduced.

free parameters (1)

Oxygen excess delta = 0.16
Estimated from the ambient-pressure T_c using the T_c-delta relation of Presland et al. This characterizes the sample but is not used to predict the high-pressure T_c.

assumptions (3)

domain assumption The 20/80 Bi-2223/KCl mixture provides a sufficiently quasihydrostatic environment at 60 GPa that the observed transition is intrinsic to bulk Bi-2223.
The paper attributes the absence of the T_c increase in 50/50 mixtures to non-hydrostatic stress and notes pressure gradients at 39 GPa, but does not demonstrate hydrostaticity at 60 GPa.
domain assumption The observed magnetic anomalies are due to the Meissner effect of a superconducting phase.
The paper infers superconductivity from susceptibility signals without resistivity or a quantified shielding fraction, despite known instrumental artifacts in the measurement setups.
domain assumption Pressure increases hole doping n_H in the CuO2 planes via charge transfer from charge reservoir layers.
Invoked in Section IV to interpret the T_c rise as a second superconducting dome; supported by literature (Refs. 47-52) but not directly measured in this work.

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Cite this review

Pith. "Pith review of Evidence for superconductivity at 190 K in a pressure-overdoped cuprate." pith.science (2026). https://pith.science/paper/YT4CPOS7

@misc{pith2026260800942,
  author       = {Pith},
  title        = {Pith review of: Evidence for superconductivity at 190 K in a pressure-overdoped cuprate},
  year         = {2026},
  howpublished = {\url{https://pith.science/paper/YT4CPOS7}},
  note         = {Machine review of arXiv:2608.00942}
}

abstract

It is well established that the critical temperature ($T_c$) of cuprate superconductors can be tuned by pressure. For example, compression decouples the hole doping from chemical doping allowing for overdoped samples far beyond what is possible at ambient pressure. In this work, multiple techniques are used to probe the onset of the Meissner effect at $T_c$ as a function of pressure in $\mathrm{Pb_{0.4}Bi_{1.6}Sr_2Ca_2Cu_3O_{10+\delta}}$ (Bi-2223) to 60 GPa in different compression environments. Samples compressed under quasihydrostatic conditions exhibit a distinctive non-monotonic pressure dependence of $T_c$ below 25 GPa, in agreement with previous reports. With further increase in pressure $T_c$ climbs continuously to 190 K at 60 GPa. Evidence for critical temperatures exceeding those reported to date for cuprates at ambient and high pressures, the results may be understood in terms of the proposed second superconducting regime at high hole doping.

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Pith tools

Reviewed August 6, 2026 · model on record in the stance chip above.

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