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arxiv: 2604.00991 · v1 · submitted 2026-04-01 · ❄️ cond-mat.str-el

Excitations across the equilibrium and photoinduced `hidden' states of magnetoresistive manganites

Shiyu Fan , Feng Jin , Taehun Kim , Umesh Kumar , Zixun Zhang , Vivek Bhartiya , Jiemin Li , Brandon Yalin
show 11 more authors
Yanhong Gu Mingqiang Gu Wen Hu Claudio Mazzoli G. Lawrence Carr Osor S. Bari\v{s}i\'c Andrey S. Mishchenko Valentina Bisogni Sobhit Singh Wenbin Wu Jonathan Pelliciari
This is my paper

Pith reviewed 2026-05-13 22:00 UTC · model grok-4.3

classification ❄️ cond-mat.str-el
keywords hidden phasesphotoinduced transitionsmanganitesRIXSpolaron excitationsJahn-Teller distortionantiferromagnetic insulatornon-equilibrium states
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The pith

Photo-excitation of strained manganite creates long-lived hidden phase with softened polarons and reduced Jahn-Teller distortion

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

The paper examines the excitations of La2/3Ca1/3MnO3 driven into an antiferromagnetic insulator by epitaxial strain. Ultrafast near-infrared pulses combined with resonant inelastic x-ray scattering, x-ray absorption, and transport measurements reveal a long-lived photo-induced state whose polaron excitations soften while the Jahn-Teller distortion is only partially relieved and phonon frequencies stay nearly constant. This state has no counterpart in the equilibrium phase diagram reached by temperature or strain alone. The authors map a polaron phase diagram by varying temperature, strain, and fluence, identifying spectroscopic signatures that separate the hidden phase from all thermodynamic regimes. The work establishes a general platform for stabilizing and characterizing non-equilibrium phases in correlated oxides.

Core claim

Upon photo-excitation of LCMO-AFI, we uncover a long-lived phase characterized by the softening of the polaron excitations, the partial suppression of the Jahn-Teller distortion, and nearly unchanged phonons, showing the emergence of a photo-excited state absent in the equilibrium phase diagram.

What carries the argument

Resonant inelastic x-ray scattering performed under ultrafast near-infrared photo-excitation, which tracks polaron, phonon, and orbital excitations to distinguish the hidden phase from equilibrium states reached by strain or temperature.

If this is right

  • The hidden phase persists for hours and can be erased by modest temperature change or a second light pulse.
  • Polaron energy directly tracks transport resistivity across both equilibrium and photo-excited regimes.
  • Epitaxial strain and laser fluence together define boundaries between multiple distinct polaronic states.
  • The same laser-RIXS method can be applied to other strained correlated materials to locate additional hidden phases.

Where Pith is reading between the lines

These are editorial extensions of the paper, not claims the author makes directly.

  • Light may stabilize intermediate electron-lattice coupling strengths unreachable by static strain tuning.
  • Reversible optical control of this state could enable fast switching of colossal magnetoresistance in thin-film devices.
  • Analogous hidden states are likely to exist in other perovskite manganites or nickelates under combined strain and photo-drive.
  • Extending the measurement to femtosecond time resolution would reveal the formation pathway of the hidden phase.

Load-bearing premise

The observed softening of polaron peaks and partial relief of Jahn-Teller distortion in RIXS spectra signal a distinct hidden phase rather than a fluence-dependent variant of the existing antiferromagnetic insulator or a measurement artifact.

What would settle it

If equilibrium RIXS spectra collected at an intermediate temperature or strain value without any laser pulse display the same softened polaron energy and reduced Jahn-Teller signature, the claim that the state is uniquely photo-induced would be falsified.

Figures

Figures reproduced from arXiv: 2604.00991 by Andrey S. Mishchenko, Brandon Yalin, Claudio Mazzoli, Feng Jin, G. Lawrence Carr, Jiemin Li, Jonathan Pelliciari, Mingqiang Gu, Osor S. Bari\v{s}i\'c, Shiyu Fan, Sobhit Singh, Taehun Kim, Umesh Kumar, Valentina Bisogni, Vivek Bhartiya, Wenbin Wu, Wen Hu, Yanhong Gu, Zixun Zhang.

Figure 1
Figure 1. Figure 1: FIG. 1. (a) Schematic view of the [PITH_FULL_IMAGE:figures/full_fig_p003_1.png] view at source ↗
Figure 2
Figure 2. Figure 2: FIG. 2. (a) RIXS spectrum of the AFI phase of LCMO/NGO (100) at the Mn [PITH_FULL_IMAGE:figures/full_fig_p005_2.png] view at source ↗
Figure 3
Figure 3. Figure 3: FIG. 3. (a) O- [PITH_FULL_IMAGE:figures/full_fig_p006_3.png] view at source ↗
Figure 4
Figure 4. Figure 4: FIG. 4. (a) RIXS intensity map of the FMM phase as a function of incident photon energy and energy loss. The XAS of FMM [PITH_FULL_IMAGE:figures/full_fig_p007_4.png] view at source ↗
Figure 5
Figure 5. Figure 5: FIG. 5. (a) Low-energy RIXS spectra of the FMM and AFI (100) phases at 100 K. (b) Low-energy RIXS spectra of the [PITH_FULL_IMAGE:figures/full_fig_p007_5.png] view at source ↗
Figure 6
Figure 6. Figure 6: FIG. 6. (a) RIXS spectra of LCMO-AFI (100) at energy [PITH_FULL_IMAGE:figures/full_fig_p008_6.png] view at source ↗
Figure 7
Figure 7. Figure 7: FIG. 7. (a,b) RIXS spectra of the FMM and AFI at different [PITH_FULL_IMAGE:figures/full_fig_p009_7.png] view at source ↗
Figure 8
Figure 8. Figure 8: FIG. 8. (a) Polaron excitation energy of the FMM (blue squares) and AFI (red squares) as a function of temperature from fitting [PITH_FULL_IMAGE:figures/full_fig_p010_8.png] view at source ↗
read the original abstract

"Hidden" phases, generated using ultrafast laser pulses (few hundred femtoseconds), with properties distinct from thermodynamic equilibrium, are appealing for technologies because they can be long-lived, with lifetimes of hours or weeks, and reversible with temperature sweeping or extra pulses. In this regard, La$_{2/3}$Ca$_{1/3}$MnO$_3$ (LCMO) stands out due to its tunability through epitaxial strain, which can drive the bulk ferromagnetic metal (FMM) into an antiferromagnetic insulator (AFI), and its susceptibility to photo-induced transitions. Indeed, AFI LCMO displays a long-lived photo-induced transition into a putative 'hidden' phase whose exact nature and excitations are still largely unknown. Here, we combine ultrafast photo-excitation in the near infrared with in situ transport, x-ray absorption (XAS), and Resonant Inelastic X-ray Scattering (RIXS) to investigate the excitations (polarons, phonons, and orbital) of the photo-excited phase of LCMO and contrast them with the thermodynamic phases achieved through strain and temperature. In the thermodynamic regime, we establish the correlation between polarons and transport, placing them in the 'strong coupling' regime of the Holstein model. Upon photo-excitation of LCMO-AFI, we uncover a long-lived phase characterized by the softening of the polaron excitations, the partial suppression of the Jahn-Teller distortion, and nearly unchanged phonons, showing the emergence of a photo-excited state absent in the equilibrium phase diagram. Finally, by varying temperature, epitaxial strain, and photo-excitation fluence, we construct a polaron phase diagram and identify the key spectroscopic signatures of each phase. Our laser-RIXS approach establishes a versatile platform for exploring photo-induced 'hidden' phases in quantum materials in non-stroboscopic conditions.

Editorial analysis

A structured set of objections, weighed in public.

Desk editor's note, referee report, simulated authors' rebuttal, and a circularity audit. Tearing a paper down is the easy half of reading it; the pith above is the substance, this is the friction.

Referee Report

2 major / 2 minor

Summary. The manuscript investigates photo-induced 'hidden' phases in La_{2/3}Ca_{1/3}MnO_3 (LCMO) using ultrafast near-infrared excitation combined with in situ transport, XAS, and RIXS measurements. It claims to identify a long-lived photo-excited state in the antiferromagnetic insulator (AFI) phase characterized by softened polaron excitations, partial suppression of Jahn-Teller distortion, and stable phonons, which is absent from the equilibrium phase diagram constructed by varying temperature, epitaxial strain, and fluence.

Significance. If the photo-excited state is shown to lie outside all equilibrium states, the work would provide a concrete spectroscopic fingerprint for a non-equilibrium phase in a tunable correlated system, strengthening the case for laser-RIXS as a tool to map hidden phases. The multi-probe approach (transport + XAS + RIXS) and the reported correlation of polarons with transport in the strong-coupling Holstein regime are positive features.

major comments (2)
  1. [Polaron phase diagram] Polaron phase diagram section: the central claim that the photo-excited state is 'absent in the equilibrium phase diagram' is load-bearing yet unsupported by quantitative bounds. The abstract states that temperature, strain, and fluence were varied to construct the diagram, but no explicit comparison (e.g., tabulated polaron energies or JT indicators with error bars) demonstrates that the photo-induced softening and partial JT suppression fall outside the entire equilibrium range reachable by strain-temperature combinations.
  2. [RIXS spectral changes] RIXS data analysis: the interpretation that observed spectral changes unambiguously indicate a new phase rather than a fluence- or strain-modified version of an existing equilibrium state requires explicit fitting procedures, resolution limits, and direct overlay of photo-excited versus equilibrium spectra at matched strain-temperature points. Without these, overlap cannot be ruled out.
minor comments (2)
  1. The statement that phonons are 'nearly unchanged' lacks quantitative metrics (energy shifts, linewidths) or reference to specific figures/tables showing the comparison.
  2. Clarify how the 'strong coupling' regime of the Holstein model is defined operationally from the observed polaron-transport correlation (e.g., specific coupling strength threshold or functional form).

Simulated Author's Rebuttal

2 responses · 0 unresolved

We thank the referee for the careful review and constructive feedback on our manuscript. We have addressed the major comments by planning explicit additions to the polaron phase diagram and RIXS analysis sections. These revisions will strengthen the quantitative support for our claims regarding the photo-induced hidden phase.

read point-by-point responses

  1. Referee: Polaron phase diagram section: the central claim that the photo-excited state is 'absent in the equilibrium phase diagram' is load-bearing yet unsupported by quantitative bounds. The abstract states that temperature, strain, and fluence were varied to construct the diagram, but no explicit comparison (e.g., tabulated polaron energies or JT indicators with error bars) demonstrates that the photo-induced softening and partial JT suppression fall outside the entire equilibrium range reachable by strain-temperature combinations.

    Authors: We agree that explicit quantitative bounds are essential to substantiate the claim. In the revised manuscript, we will add a dedicated table listing polaron excitation energies and Jahn-Teller distortion indicators (extracted from XAS and RIXS) for all equilibrium states reached by varying temperature and epitaxial strain, each with error bars derived from multiple measurements. We will also plot these values against the photo-excited results to demonstrate that the observed softening and partial JT suppression lie outside the equilibrium range. This addition directly addresses the need for tabulated comparisons. revision: yes

  2. Referee: RIXS data analysis: the interpretation that observed spectral changes unambiguously indicate a new phase rather than a fluence- or strain-modified version of an existing equilibrium state requires explicit fitting procedures, resolution limits, and direct overlay of photo-excited versus equilibrium spectra at matched strain-temperature points. Without these, overlap cannot be ruled out.

    Authors: We concur that detailed analysis procedures are required for unambiguous interpretation. In the revision, we will describe the fitting model used for the RIXS spectra (including Lorentzian or Gaussian components for polaron and phonon features), specify the instrumental resolution limits, and provide direct spectral overlays comparing the photo-excited state to equilibrium spectra at matched strain-temperature points. These overlays will include quantitative metrics such as peak position shifts and intensity changes to rule out overlap with existing equilibrium states. revision: yes

Circularity Check

0 steps flagged

No circularity: purely observational experimental claims with empirical phase diagram

full rationale

The manuscript reports RIXS, XAS, and transport measurements on photo-excited LCMO films under controlled strain, temperature, and fluence. All central claims (polaron softening, partial JT suppression, unchanged phonons, and a phase absent from the equilibrium diagram) are direct comparisons of measured spectra to equilibrium reference states obtained by the same experimental knobs. No equations, fitted parameters, or predictions are presented that reduce by construction to the input data; the polaron phase diagram is assembled by enumerating the same external variables used to acquire the data. No self-citation load-bearing steps, uniqueness theorems, or ansatzes appear in the derivation chain. The work is therefore self-contained against external benchmarks.

Axiom & Free-Parameter Ledger

0 free parameters · 1 axioms · 0 invented entities

The study is experimental and relies on standard condensed-matter interpretations rather than new derivations; the Holstein model is invoked only for placing the thermodynamic regime in the strong-coupling limit.

axioms (1)
  • domain assumption Polaron excitations in the thermodynamic regime of LCMO lie in the strong-coupling limit of the Holstein model and correlate directly with transport
    Used to interpret the correlation between polarons and transport in equilibrium phases.

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