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arxiv: 2604.09457 · v1 · submitted 2026-04-10 · ❄️ cond-mat.supr-con · cond-mat.mtrl-sci· cond-mat.str-el

Recognition: unknown

Pressure-Induced Superconducting-like Transition in the it d-wave Altermagnet Candidate CsV₂Se₂O

Yuanzhe Li , Yilin Han , Liu Yang , Wanli He , Pengda Ye , Wencheng Huang , Jiabin Qiao , Yuemei Li
show 24 more authors
Xiaodong Sun Tingli He Jiayi Han Yuxiang Chen Ruifeng Tian Hao Sun Yuwei Liu Feng Wu Baoshan Song Zhengtai Liu Mao Ye Yaobo Huang Kenichi Ozawa Ji Dai Massimo Tallarida Shengtao Cui Jie Chen Meiling Jin Wayne Zheng Chaoyu Chen Zhiwei Wang Zhi-Ming Yu Xiang Li Yugui Yao
Authors on Pith no claims yet

Pith reviewed 2026-05-10 16:11 UTC · model grok-4.3

classification ❄️ cond-mat.supr-con cond-mat.mtrl-scicond-mat.str-el
keywords altermagnetsuperconductivitypressure tuningdensity wavemagnetoresistancevanadium oxychalcogenideCsV2Se2O
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The pith

Applying pressure to the d-wave altermagnet candidate CsV₂Se₂O suppresses its density-wave anomaly near 100 K and induces a reproducible resistive downturn below 3 K that is suppressed by magnetic field.

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

The study investigates the lattice, electronic structure, and transport of CsV₂Se₂O, a square-net material proposed as a d-wave altermagnet. At ambient pressure the compound is weakly insulating with a density-wave-like feature and properties consistent with a G-type compensated antiferromagnet. Hydrostatic compression eliminates the density-wave anomaly, reverses the sign of magnetoresistance, and produces a low-temperature resistive drop that remains unchanged across different samples and pressure media. The authors map a pressure-driven evolution from the reconstructed insulating parent state to strange-metal-like transport accompanied by the superconducting-like anomaly, drawing parallels to the parent compounds of cuprates and nickelates.

Core claim

Under applied pressure the density-wave-like anomaly is suppressed, magnetoresistance changes from predominantly negative to positive, and a superconducting-like resistive downturn appears below approximately 3 K. This anomaly is reproducible across samples and pressure-transmitting media and is suppressed by magnetic field. Room-temperature X-ray diffraction detects no symmetry lowering yet reveals a compressibility anomaly in the same pressure range, indicating an electronic reconstruction within the G-type compensated antiferromagnetic background.

What carries the argument

Hydrostatic pressure as the control parameter that suppresses the density-wave order in the G-type compensated antiferromagnetic state and enables the low-temperature resistive anomaly.

Load-bearing premise

The resistive downturn below 3 K arises from superconductivity rather than another low-temperature electronic instability.

What would settle it

Detection of a Meissner effect or a specific-heat jump coinciding with the resistive drop would confirm superconductivity, while their absence would indicate a different origin.

read the original abstract

Altermagnetism generates exchange-type spin splitting without net magnetization and, in its $\it d$-wave form, resembles the angular symmetry of unconventional $\it d$-wave superconductivity. Whether this correspondence bears directly on superconducting instabilities in real correlated materials remains open. Here we study the quasi-two-dimensional vanadium oxychalcogenide CsV$_2$Se$_2$O (CVSO), a square-net $\it d$-wave altermagnet candidate, through combined experimental and theoretical investigation of its lattice structure, electronic structure and transport properties. At ambient pressure, CVSO is a weakly insulating parent state with a density-wave-like anomaly near 100 K, and its bulk properties are most consistent with a G-type compensated antiferromagnetic background. Under compression, the density-wave-like feature is suppressed, the magnetoresistance evolves from predominantly negative to positive, and a superconducting-like resistive downturn emerges below about 3 K. This low-temperature anomaly is reproducible across samples and pressure media, and is suppressed by magnetic field. Room-temperature X-ray diffraction reveals no symmetry lowering, whereas does show a pronounced compressibility anomaly over the same pressure range. CVSO thus reveals a pressure-tuned phase diagram in which a reconstructed weakly insulating parent state gives way to strange-metal-like transport and superconducting-like behavior, echoing broader phenomenology associated with unconventional superconductors, including cuprates and nickelates.

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 the quasi-2D vanadium oxychalcogenide CsV₂Se₂O as a d-wave altermagnet candidate using X-ray diffraction, transport measurements, and theory. At ambient pressure it exhibits a weakly insulating state with a density-wave-like anomaly near 100 K, consistent with G-type compensated antiferromagnetism. Under pressure the density-wave feature is suppressed, magnetoresistance changes from negative to positive, and a reproducible resistive downturn appears below ~3 K that is suppressed by magnetic field. Room-temperature XRD shows a compressibility anomaly without symmetry lowering. The authors interpret the low-T feature as a pressure-induced superconducting-like transition, yielding a phase diagram analogous to those of cuprates and nickelates.

Significance. If the resistive downturn is confirmed as bulk superconductivity, this would represent a notable finding by linking d-wave altermagnetism to pairing instabilities in a new correlated material, extending the phenomenology of pressure-tuned unconventional superconductors. Strengths include the reproducibility of the transport anomaly across samples and pressure media, the clear compressibility anomaly in XRD, and the theoretical framing of the altermagnetic parent state. The work provides suggestive evidence for a reconstructed strange-metal-like regime but its impact is currently limited by the absence of thermodynamic or magnetic confirmation of superconductivity.

major comments (2)
  1. [Abstract / low-T transport] Abstract and low-temperature transport section: the central claim of a 'superconducting-like' transition rests on a field-suppressible resistive downturn below ~3 K that is reproducible across samples and media. However, the manuscript reports neither zero resistance nor specific-heat or diamagnetic signatures. In a quasi-2D compensated antiferromagnet this feature could arise from weak localization, partial gapping, or filamentary order rather than bulk superconductivity; this interpretation is load-bearing for the claimed analogy to cuprate/nickelate phase diagrams.
  2. [Ambient-pressure state] Ambient-pressure characterization section: the parent state is assigned as 'most consistent with a G-type compensated antiferromagnetic background' with d-wave altermagnetic character on the basis of bulk properties alone. Direct verification (e.g., neutron diffraction) is not presented; while not fatal, this weakens the positioning of CVSO as an altermagnet candidate and the broader theoretical context for the pressure-induced behavior.
minor comments (2)
  1. [Figures] The resistivity and magnetoresistance figures would benefit from explicit labeling of the ~3 K downturn temperature scale and inclusion of data from multiple pressure media or samples to visually emphasize reproducibility.
  2. [Results] Clarify the precise definition of 'density-wave-like anomaly' near 100 K and its relation to the compressibility anomaly observed in XRD; a brief comparison table of transition temperatures under pressure would aid readability.

Simulated Author's Rebuttal

2 responses · 0 unresolved

We thank the referee for the careful and constructive review of our manuscript. We address each major comment point by point below, indicating where revisions have been made to clarify interpretations and acknowledge limitations while preserving the core findings.

read point-by-point responses

  1. Referee: [Abstract / low-T transport] Abstract and low-temperature transport section: the central claim of a 'superconducting-like' transition rests on a field-suppressible resistive downturn below ~3 K that is reproducible across samples and media. However, the manuscript reports neither zero resistance nor specific-heat or diamagnetic signatures. In a quasi-2D compensated antiferromagnet this feature could arise from weak localization, partial gapping, or filamentary order rather than bulk superconductivity; this interpretation is load-bearing for the claimed analogy to cuprate/nickelate phase diagrams.

    Authors: We acknowledge that the observed feature is a resistive downturn rather than a transition to zero resistance, and that thermodynamic or diamagnetic confirmation of bulk superconductivity is absent. This is a genuine limitation given the challenges of high-pressure measurements on small samples. Alternative explanations such as weak localization or filamentary effects cannot be fully excluded based on transport alone. In the revised manuscript we have updated the abstract and low-T transport section to emphasize the 'superconducting-like' character, explicitly discuss possible alternative origins, and qualify the phase-diagram analogy with appropriate caveats. The reproducibility across samples and media, together with field suppression, still provides suggestive evidence consistent with the broader pressure-tuned evolution from a density-wave state to strange-metal-like transport. revision: partial

  2. Referee: [Ambient-pressure state] Ambient-pressure characterization section: the parent state is assigned as 'most consistent with a G-type compensated antiferromagnetic background' with d-wave altermagnetic character on the basis of bulk properties alone. Direct verification (e.g., neutron diffraction) is not presented; while not fatal, this weakens the positioning of CVSO as an altermagnet candidate and the broader theoretical context for the pressure-induced behavior.

    Authors: The assignment of G-type compensated antiferromagnetism is based on the consistency of our bulk transport, magnetoresistance, and density-functional-theory calculations that reproduce the observed density-wave anomaly and d-wave spin-splitting symmetry. We agree that neutron diffraction would constitute direct microscopic verification. We have added a clarifying sentence in the revised manuscript noting that the magnetic structure remains a candidate assignment pending such measurements and that future neutron studies would be desirable. This does not change the theoretical framing, as the pressure-induced suppression of the density-wave feature and emergence of the low-T anomaly are discussed relative to the calculated electronic structure of the parent state. revision: yes

Circularity Check

0 steps flagged

No significant circularity detected

full rationale

The paper reports direct experimental measurements of resistivity, magnetoresistance, and room-temperature X-ray diffraction under pressure, together with electronic-structure calculations for the ambient-pressure state. No load-bearing derivations, fitted parameters renamed as predictions, or self-referential equations appear in the abstract or described claims. The ambient-pressure assignment to a G-type compensated antiferromagnet is presented as 'most consistent' with bulk properties rather than derived from a uniqueness theorem or self-citation chain. The pressure-induced resistive downturn is interpreted as superconducting-like on the basis of its reproducibility and field suppression, without any internal reduction to prior fitted inputs. The overall chain is therefore self-contained and externally falsifiable via the reported transport and diffraction data.

Axiom & Free-Parameter Ledger

0 free parameters · 1 axioms · 0 invented entities

The central claim rests on standard experimental interpretations of transport and diffraction data with no additional free parameters, ad-hoc axioms, or invented entities introduced in the abstract.

axioms (1)
  • domain assumption Conventional interpretation of a field-suppressible resistive drop as possible superconductivity
    The abstract equates the low-temperature anomaly with a superconducting-like transition based on standard condensed-matter phenomenology.

pith-pipeline@v0.9.0 · 5684 in / 1398 out tokens · 46032 ms · 2026-05-10T16:11:22.251087+00:00 · methodology

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Forward citations

Cited by 1 Pith paper

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score.

  1. Finite temperature pair density wave superconductivity in $d$-wave altermagnets

    cond-mat.supr-con 2026-05 unverdicted novelty 7.0

    D-wave altermagnets host a robust finite-temperature pair-density-wave superconducting phase driven by momentum-dependent spin splitting.

Reference graph

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