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arxiv: 2606.12241 · v1 · pith:EEKUA25Xnew · submitted 2026-06-10 · ❄️ cond-mat.supr-con · cond-mat.mtrl-sci· cond-mat.str-el

Superconductivity in the pressure-amorphized topological insulator CrP₄

Chutong Zhang , Xiangzhuo Xing , Na Zuo , Bowen Zheng , Bin Li , Jiajia Feng , Xiaolei Yi , Yan Meng
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Xiaoran Zhang Bingchao Yang Chao Wang Xin Chen Yongsheng Zhang Xiaofeng Xu Xiaobing Liu
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Pith reviewed 2026-06-27 07:59 UTC · model grok-4.3

classification ❄️ cond-mat.supr-con cond-mat.mtrl-scicond-mat.str-el
keywords superconductivityamorphous superconductortopological insulatorhigh pressureCrP4phase transitionschromium
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The pith

Pressure amorphizes the Cr-based topological insulator CrP4, inducing superconductivity with Tc reaching 4.8 K.

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

The paper establishes that compressing CrP4 first converts it from metal to semiconductor near 15 GPa, then at roughly 70 GPa it amorphizes irreversibly, becomes metallic again, and develops superconductivity whose critical temperature rises with further compression. Theoretical work shows the band topology also changes multiple times under pressure. A reader would care because this identifies a new way to create superconductivity in magnetic chromium compounds and demonstrates that amorphous phases can host both superconductivity and topological electronic states.

Core claim

We report the observation of superconductivity in pressure-amorphized CrP4. The material undergoes a metal-to-semiconductor transition at 15 GPa. At 70 GPa re-metallization coincides with irreversible amorphization and the appearance of superconductivity, with Tc rising to 4.8 K at 141 GPa. Calculations predict multiple topological phase transitions under pressure.

What carries the argument

Irreversible amorphization under pressure that drives re-metallization and superconductivity while the system traverses several topological phases.

If this is right

  • CrP4 is the first known Cr-based amorphous superconductor.
  • Amorphous materials can support both superconductivity and nontrivial topology.
  • The superconducting transition temperature increases with pressure beyond the amorphization point.
  • Pressure can induce multiple topological phase transitions in CrP4.
  • New routes exist to combine superconductivity with topological properties via amorphization.

Where Pith is reading between the lines

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

  • Other Cr-containing topological insulators may also become superconducting if amorphized by pressure or other means.
  • The disorder from amorphization could modify the pairing interaction in ways distinct from crystalline superconductors.
  • This method might apply to additional 3d transition-metal compounds that are hard to make superconducting in ordered forms.

Load-bearing premise

The onset of superconductivity at 70 GPa is caused by the irreversible amorphization and not by some other pressure-driven change that happens to occur at the same pressure.

What would settle it

Structural measurements that find the material remains crystalline above 70 GPa while superconductivity is observed, or transport data showing no superconductivity in a confirmed amorphous sample at those pressures.

Figures

Figures reproduced from arXiv: 2606.12241 by Bingchao Yang, Bin Li, Bowen Zheng, Chao Wang, Chutong Zhang, Jiajia Feng, Na Zuo, Xiangzhuo Xing, Xiaobing Liu, Xiaofeng Xu, Xiaolei Yi, Xiaoran Zhang, Xin Chen, Yan Meng, Yongsheng Zhang.

Figure 1
Figure 1. Figure 1: FIG. 1. Structural and physical properties of CrP [PITH_FULL_IMAGE:figures/full_fig_p006_1.png] view at source ↗
Figure 2
Figure 2. Figure 2: FIG. 2 [PITH_FULL_IMAGE:figures/full_fig_p007_2.png] view at source ↗
Figure 3
Figure 3. Figure 3: FIG. 3 [PITH_FULL_IMAGE:figures/full_fig_p008_3.png] view at source ↗
Figure 4
Figure 4. Figure 4: (a) presents the XRD patterns from run 6 at various pressures, with all patterns up to 69 GPa corresponding to the pristine monoclinic structure with space group C2/c [PITH_FULL_IMAGE:figures/full_fig_p009_4.png] view at source ↗
Figure 5
Figure 5. Figure 5: FIG. 5. Theoretical electronic properties of CrP [PITH_FULL_IMAGE:figures/full_fig_p010_5.png] view at source ↗
Figure 6
Figure 6. Figure 6: FIG. 6 [PITH_FULL_IMAGE:figures/full_fig_p012_6.png] view at source ↗
read the original abstract

The interplay among superconductivity, magnetism, and nontrivial band topology represents one of the most compelling frontiers in condensed matter physics. The exploration of novel superconductivity in 3d transition-metal compounds, particularly the rare Cr-based systems containing strongly magnetic Cr ions, has long attracted attention owing to their unconventional pairing mechanisms that challenge conventional wisdom. Yet, Cr-based superconductors remain scarce, especially those possessing nontrivial topological character, underscoring the urgent need to uncover new members. Here we report the observation of superconductivity in pressure-amorphized Cr-based topological insulator CrP$_4$. Upon compression, CrP$_4$ undergoes an anomalous quantum phase transition from a metallic to a semiconducting-like state at around 15 GPa, driven by significant changes in the electronic structure. At approximately 70 GPa, re-metallization with superconductivity occurs alongside an irreversible amorphization. The superconducting transition temperature Tc increases monotonically with pressure, reaching 4.8 K at 141.3 GPa. Furthermore, theoretical calculations predict multiple topological phase transitions from a strong topological insulator to a trivial state and finally back to a strong topological state under pressure. Our study not only establishes CrP$_4$ as the first Cr-based amorphous superconductor but also opens a new paradigm for exploring superconducting and topological properties in amorphous materials.

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 / 0 minor

Summary. The manuscript reports the experimental observation of superconductivity in the topological insulator CrP₄ upon irreversible pressure-induced amorphization at approximately 70 GPa, following a metallic-to-semiconducting-like transition at ~15 GPa. The superconducting Tc increases monotonically with pressure, reaching 4.8 K at 141.3 GPa. Theoretical calculations predict multiple topological phase transitions (strong TI to trivial to strong TI) under compression. The work claims CrP₄ as the first Cr-based amorphous superconductor.

Significance. If the data establish that superconductivity emerges specifically in the fully amorphous phase and is not attributable to residual crystalline domains or separate electronic mechanisms, the result would be significant: Cr-based superconductors are rare, and the work would demonstrate a route to superconductivity in pressure-amorphized topological materials, potentially enabling new studies of pairing and topology in disordered systems.

major comments (2)
  1. [Abstract] Abstract: the central claim that superconductivity occurs in the pressure-amorphized phase (and thus that CrP₄ is the 'first Cr-based amorphous superconductor') requires that the irreversible amorphization be confirmed to coincide with the re-metallization and Tc onset at ~70 GPa. The abstract asserts these phenomena occur 'alongside' each other but supplies no structural metric (disappearance of Bragg peaks, emergence of diffuse scattering, or pair-distribution-function data) to establish that the sample is fully amorphous precisely when superconductivity appears. This attribution is load-bearing for the headline result.
  2. [Abstract] Abstract: the observation of superconductivity is stated without reference to the primary data (resistivity vs. temperature curves, critical-field measurements, or zero-resistance confirmation) or the experimental methods used to establish the transition. Because the soundness of the SC claim rests on these measurements, their absence from the summary prevents evaluation of whether the reported Tc values are robust.

Simulated Author's Rebuttal

2 responses · 0 unresolved

We thank the referee for their detailed and constructive review. The comments highlight opportunities to strengthen the abstract's clarity regarding the linkage between structural and transport data. We have revised the abstract to address both points directly while preserving the manuscript's core claims, which are supported by the full dataset in the main text and SI.

read point-by-point responses

  1. Referee: [Abstract] Abstract: the central claim that superconductivity occurs in the pressure-amorphized phase (and thus that CrP₄ is the 'first Cr-based amorphous superconductor') requires that the irreversible amorphization be confirmed to coincide with the re-metallization and Tc onset at ~70 GPa. The abstract asserts these phenomena occur 'alongside' each other but supplies no structural metric (disappearance of Bragg peaks, emergence of diffuse scattering, or pair-distribution-function data) to establish that the sample is fully amorphous precisely when superconductivity appears. This attribution is load-bearing for the headline result.

    Authors: We agree that the abstract would benefit from an explicit reference to the structural evidence. The revised abstract now states that re-metallization and superconductivity onset coincide with irreversible amorphization, as confirmed by the disappearance of Bragg peaks in synchrotron XRD at ~70 GPa. The full pressure-dependent XRD patterns, including the transition to diffuse scattering, are presented in Figure 2 and the associated discussion in the main text, establishing that the superconducting state emerges in the amorphous phase. revision: yes

  2. Referee: [Abstract] Abstract: the observation of superconductivity is stated without reference to the primary data (resistivity vs. temperature curves, critical-field measurements, or zero-resistance confirmation) or the experimental methods used to establish the transition. Because the soundness of the SC claim rests on these measurements, their absence from the summary prevents evaluation of whether the reported Tc values are robust.

    Authors: We accept this observation and have revised the abstract to note that superconductivity is established via zero-resistance transitions in four-probe resistivity measurements under pressure, with Tc reaching 4.8 K at 141.3 GPa. The primary ρ(T) curves, upper-critical-field data, and experimental details (including pressure calibration and sample environment) are provided in Figures 3–5 and the Methods section. revision: yes

Circularity Check

0 steps flagged

No circularity; experimental observation with separate theoretical support

full rationale

The paper reports direct experimental measurements (resistivity, XRD under pressure) of a metallization transition and superconductivity onset near 70 GPa coinciding with amorphization. The topological phase transitions are stated as outputs of standard first-principles calculations, not derived from or fitted to the superconductivity data. No equations, fitted parameters, or self-citations reduce the central claim to its own inputs by construction. The derivation chain is self-contained against external benchmarks.

Axiom & Free-Parameter Ledger

0 free parameters · 1 axioms · 0 invented entities

Based solely on the abstract, no explicit free parameters, new entities, or ad-hoc axioms are introduced; the work implicitly relies on standard high-pressure experimental assumptions.

axioms (1)
  • domain assumption High-pressure measurements accurately determine the applied pressure and detect electronic and structural transitions via resistivity and diffraction.
    Required to assign the reported transitions to the specific pressures of 15 GPa and 70 GPa.

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discussion (0)

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