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arxiv: 2604.13553 · v1 · submitted 2026-04-15 · ❄️ cond-mat.str-el · cond-mat.supr-con

Anomalous Low-temperature Magnetotransport in Kagome Metal CsCr₃Sb₅ under Pressure

Pith reviewed 2026-05-10 12:48 UTC · model grok-4.3

classification ❄️ cond-mat.str-el cond-mat.supr-con
keywords cscrmagnetotransportsignaturesanomalyelectronicincludingkagomenature
0
0 comments X

The pith

Magnetotransport under pressure reveals signatures below 30 K that suggest an additional exotic electronic order in CsCr3Sb5.

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

The paper investigates the nature of the resistivity anomaly at T3 around 30 K in the kagome metal CsCr3Sb5. Using magnetotransport experiments under hydrostatic pressure, it uncovers a non-trivial temperature dependence of the Hall coefficient, multi-band transport characteristics, and a pressure-enhanced anomalous-Hall-like effect below T3. These features closely match those seen in the charge-density-wave state of the related compound CsV3Sb5. This resemblance leads to the suggestion that CsCr3Sb5 may contain yet another exotic electronic order in addition to its known phases.

Core claim

Below T3, magnetotransport in CsCr3Sb5 shows a non-trivial temperature dependence of the Hall coefficient, multi-band characteristics, and pressure-enhanced anomalous-Hall-like effect. These signatures resemble those in the charge-density-wave state of CsV3Sb5, suggesting the possibility of an additional, exotic electronic order in CsCr3Sb5.

What carries the argument

The pressure-dependent Hall resistivity measurements that expose the anomalous behaviors and multi-band nature below the T3 temperature.

Load-bearing premise

The magnetotransport signatures below T3 are due to a new exotic electronic order instead of conventional changes in scattering or Fermi surface under pressure.

What would settle it

Detection of no additional ordering transition at T3 by techniques such as X-ray scattering or nuclear magnetic resonance, despite the transport anomalies, would question the exotic order interpretation.

read the original abstract

As a unique kagome superconductor displaying clear signatures of strong electronic correlations, CsCr$_3$Sb$_5$ has drawn much attention. Its rich temperature-pressure phase diagram features intertwined orders including pressure-induced superconductivity and two density-wave-like phases, making it an outstanding platform to explore the complex coexistence and competition of multiple quantum orders. At around 30 K, which we designate as $T_3$, a possible anomaly manifesting as a hump in the resistivity has been observed, yet its nature remains largely unexplored due to limited supporting evidence from other probes. Here, we conducted systematic magnetotransport experiments under hydrostatic pressure to investigate the nature of this anomaly. Our results reveal an abundance of intriguing magnetotransport signatures below $T_3$, including a non-trivial temperature dependence of the Hall coefficient, multi-band characteristics, and pressure-enhanced anomalous-Hall-like effect. These signatures bear resemblance to those observed in the charge-density-wave state in the sister compound CsV$_3$Sb$_5$. These findings suggest the possibility of an additional, exotic electronic order in CsCr$_3$Sb$_5$, calling for further detailed investigations.

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 / 3 minor

Summary. The manuscript reports hydrostatic-pressure magnetotransport measurements on the kagome metal CsCr₃Sb₅, focusing on the resistivity anomaly at T₃ ≈ 30 K. Below T₃ the authors observe a non-monotonic Hall coefficient, multi-band-like magnetoresistance, and a pressure-enhanced anomalous-Hall-like signal; these features are noted to resemble transport signatures previously reported in the CDW state of CsV₃Sb₅. The central claim is therefore that the data suggest the possibility of an additional exotic electronic order in CsCr₃Sb₅, while explicitly calling for further investigations.

Significance. If the observed transport anomalies indeed arise from a new ordered state, the work would enlarge the known phase diagram of this correlated kagome platform and furnish a concrete experimental handle on the competition among superconductivity, density-wave order, and possible additional broken-symmetry phases. The pressure-dependent data set is timely and the authors’ restrained interpretation (“possibility”, “resemblance”, “calling for further detailed investigations”) matches the current level of supporting evidence.

major comments (2)
  1. [Results section describing the Hall resistivity and anomalous-Hall-like effect] The identification of an anomalous-Hall-like contribution is central to the resemblance argument, yet the manuscript does not specify the precise subtraction procedure (ordinary Hall term, high-field linear background, or multi-band decomposition) nor the field range over which the nonlinear component is extracted. Without these details it is difficult to assess whether the pressure enhancement is intrinsic or an artifact of changing carrier densities and scattering rates.
  2. [Discussion of Hall coefficient and magnetoresistance data] The multi-band character is invoked to explain both the Hall temperature dependence and the magnetoresistance, but no explicit two-band or multi-band fits, extracted carrier densities, or mobility ratios are presented. A quantitative comparison with the sister compound CsV₃Sb₅ would be required to turn the qualitative resemblance into a stronger constraint on possible order.
minor comments (3)
  1. [All figures] Figure captions should explicitly state the pressure values, field orientations, and whether data are raw or symmetrized.
  2. [Introduction] A brief reference to the original work that first reported the T₃ anomaly would help readers place the present study in context.
  3. [Data-analysis paragraphs] Error bars or statistical uncertainties on the extracted Hall coefficients and anomalous-Hall amplitudes should be shown or tabulated.

Simulated Author's Rebuttal

2 responses · 0 unresolved

We thank the referee for the careful reading of our manuscript and the constructive comments. The points raised help clarify the presentation of our magnetotransport results. We address each major comment below and indicate the corresponding revisions.

read point-by-point responses
  1. Referee: [Results section describing the Hall resistivity and anomalous-Hall-like effect] The identification of an anomalous-Hall-like contribution is central to the resemblance argument, yet the manuscript does not specify the precise subtraction procedure (ordinary Hall term, high-field linear background, or multi-band decomposition) nor the field range over which the nonlinear component is extracted. Without these details it is difficult to assess whether the pressure enhancement is intrinsic or an artifact of changing carrier densities and scattering rates.

    Authors: We agree that the subtraction procedure must be stated explicitly. In our analysis the anomalous-Hall-like term was isolated by subtracting a linear fit performed on the high-field portion of the Hall resistivity (typically 4–7 T, where the ordinary Hall response dominates). This procedure was applied uniformly across all pressures and temperatures below T3. We will revise the manuscript to describe the fitting range, the rationale for assuming a linear high-field background, and the consistency checks performed. A supplementary figure showing raw Hall data together with the subtracted linear background and the resulting nonlinear component will also be added. revision: yes

  2. Referee: [Discussion of Hall coefficient and magnetoresistance data] The multi-band character is invoked to explain both the Hall temperature dependence and the magnetoresistance, but no explicit two-band or multi-band fits, extracted carrier densities, or mobility ratios are presented. A quantitative comparison with the sister compound CsV₃Sb₅ would be required to turn the qualitative resemblance into a stronger constraint on possible order.

    Authors: We accept that explicit multi-band modeling would strengthen the quantitative link to CsV3Sb5. Because the magnetoresistance remains modest and the Hall data are available only up to 7 T, a unique two-band decomposition is under-constrained; we will nevertheless include two-band fits to both the longitudinal magnetoresistance and the Hall resistivity in the revised manuscript, reporting the resulting carrier densities and mobility ratios together with the fit residuals. For the comparison with CsV3Sb5 we will add a short paragraph that juxtaposes the temperature dependence of the Hall coefficient below the respective ordering temperatures using values from the published literature, while noting the limitations of the two-band approximation in both compounds. These additions will be presented as supporting evidence rather than definitive proof. revision: partial

Circularity Check

0 steps flagged

No significant circularity identified

full rationale

This manuscript is a purely experimental report of magnetotransport data collected under hydrostatic pressure. No theoretical derivation, ansatz, fitted parameter, or prediction is advanced that could reduce to its own inputs by construction. The central statements remain observational (non-monotonic Hall coefficient, multi-band-like MR, pressure-enhanced anomalous-Hall-like signal below T3) and are presented only as bearing resemblance to CDW signatures in CsV3Sb5, with explicit language of “suggest the possibility” and “calling for further detailed investigations.” No self-citation chain, uniqueness theorem, or renaming of known results is invoked as load-bearing support. The argument is therefore self-contained as direct measurement.

Axiom & Free-Parameter Ledger

0 free parameters · 1 axioms · 0 invented entities

The central claim rests on standard interpretations of magnetotransport data in multi-band metals; no free parameters, new entities, or ad-hoc axioms are introduced in the abstract.

axioms (1)
  • domain assumption Standard semiclassical transport theory and multi-band Hall-effect analysis apply to the measured resistivities and Hall coefficients.
    Used to interpret the non-trivial temperature dependence of the Hall coefficient and the anomalous-Hall-like term.

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Reference graph

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