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arxiv: 2606.29749 · v1 · pith:HPI5UU6Bnew · submitted 2026-06-29 · ❄️ cond-mat.supr-con · cond-mat.str-el

Electronic inhomogeneity in Cs- and Sb-terminated surfaces of CsV₃Sb₅ probed by scanning photoemission spectromicroscopy

T. Mizokawa , G. Tomassucci , M. Hattori , F. Minati , L. Tortora , A. Barinov , Z. Wang , J.-X. Yin
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N. L. Saini
This is my paper

Pith reviewed 2026-06-30 04:28 UTC · model grok-4.3

classification ❄️ cond-mat.supr-con cond-mat.str-el
keywords CsV3Sb5kagome superconductorsurface terminationscanning photoemission microscopycharge density waveelectronic inhomogeneitySb 5p bandband folding
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The pith

Cs-terminated surfaces of CsV3Sb5 show less electronic inhomogeneity than Sb-terminated ones and are more suitable for kagome superconductor interfaces.

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

Scanning photoemission microscopy maps the electronic structures of Cs- and Sb-terminated surfaces in the kagome superconductor CsV3Sb5. The Cs-terminated surface band structure remains close to bulk, while the Sb-terminated surface is substantially modified near the K/H point. Below the charge density wave transition temperature the contrast between terminations decreases, yet the Sb 5p band on Cs-terminated regions exhibits electronic inhomogeneity that slightly increases and is linked to out-of-plane Sb disorders. This inhomogeneity influences band folding along Γ-A and is expected to affect Sb 5p-V 3d hybridization at the interface, with the effect strongest at Γ/A, noticeable at K/H, and negligible at M/L. The results therefore identify Cs termination as the less inhomogeneous option for interfaces.

Core claim

The SPEM results show that the Cs-terminated surface band structure is rather close to the bulk while the Sb-terminated one is substantially modified around K/H; the Sb 5p band of the Cs-terminated region exhibits electronic inhomogeneity related to disorders of the out-of-plane Sb atoms that is relevant for the band folding along Γ-A with the charge density wave, and the less inhomogeneous Cs termination is more suitable for interfaces although its inhomogeneity affects Sb 5p-V 3d hybridization.

What carries the argument

Scanning photoemission spectromicroscopy (SPEM) that spatially resolves band structures and inhomogeneities across Cs- and Sb-terminated surface regions in momentum space.

If this is right

  • The less inhomogeneous Cs termination is more suitable for interfaces of kagome superconductors.
  • Inhomogeneity on the Cs-terminated surface affects Sb 5p-V 3d hybridization at the interface, significant at Γ/A, noticeable at K/H, and negligible at M/L.
  • The inhomogeneity of the Sb 5p band on the Cs-terminated surface slightly increases below the charge density wave transition temperature.
  • The contrast between Cs- and Sb-terminated regions is reduced below the charge density wave transition temperature.

Where Pith is reading between the lines

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

  • Surface preparation methods that favor uniform Cs termination could improve interface quality in devices based on kagome superconductors.
  • Because the inhomogeneity ties to CDW band folding, similar surface effects may influence the superconducting gap or other low-temperature electronic properties.
  • Direct measurements on fabricated heterostructures using Cs-terminated surfaces would test whether the reduced inhomogeneity translates to better interface performance.

Load-bearing premise

The observed electronic inhomogeneity of the Sb 5p band on the Cs-terminated surface is caused by disorders of the out-of-plane Sb atoms.

What would settle it

High-resolution structural imaging or atomically resolved spectroscopy that directly correlates the positions or displacements of out-of-plane Sb atoms with the measured spatial variations in Sb 5p band intensity or energy across the Cs-terminated surface.

Figures

Figures reproduced from arXiv: 2606.29749 by A. Barinov, F. Minati, G. Tomassucci, J.-X. Yin, L. Tortora, M. Hattori, N. L. Saini, T. Mizokawa, Z. Wang.

Figure 1
Figure 1. Figure 1: FIG. 1. (Color online) (a) Crystal structure of CsV [PITH_FULL_IMAGE:figures/full_fig_p002_1.png] view at source ↗
Figure 2
Figure 2. Figure 2: FIG. 2. (Color online) SPEM images (top and bottom panels) [PITH_FULL_IMAGE:figures/full_fig_p003_2.png] view at source ↗
Figure 3
Figure 3. Figure 3: FIG. 3. (Color online) SPEM images (upper panels) and pho [PITH_FULL_IMAGE:figures/full_fig_p004_3.png] view at source ↗
Figure 5
Figure 5. Figure 5: FIG. 5. (Color online) (a) Fermi surface map and (b) constant [PITH_FULL_IMAGE:figures/full_fig_p004_5.png] view at source ↗
Figure 4
Figure 4. Figure 4: FIG. 4. (Color online) SPEM images (upper panels) and pho [PITH_FULL_IMAGE:figures/full_fig_p004_4.png] view at source ↗
Figure 6
Figure 6. Figure 6: FIG. 6. (Color online) Band dispersions along the Γ-K-M or [PITH_FULL_IMAGE:figures/full_fig_p005_6.png] view at source ↗
Figure 7
Figure 7. Figure 7: FIG. 7. (Color online) (a) SPEM image and photoemission spectra for Γ/A point taken at 60 K and (b) those for a narrower [PITH_FULL_IMAGE:figures/full_fig_p006_7.png] view at source ↗
read the original abstract

Electronic structures of Cs- and Sb-terminated surfaces of a kagome superconductor CsV$_3$Sb$_5$ have been elucidated by means of scanning photoemission microscopy (SPEM). The observed band structure of the Cs-terminated surface is rather close to that of the bulk while that of the Sb-terminated one is substantially modified around K/H point of the Brillouin zone. While the contrast between the Cs- and Sb-terminated regions is reduced below the charge density wave transition temperature, the Sb 5$p$ band of Cs-terminated region exhibits electronic inhomogeneity which slightly increases below it. The inhomogeneity of the Sb 5$p$ band would be related to disorders of the out-of-plane Sb and relevant for the band folding along $\Gamma$-A with the charge density wave. The SPEM results suggest that the less inhomogeneous Cs termination is more suitable for interface of kagome superconductors. However, the inhomogeneity of Cs termination, which is significant at $\Gamma$/A, noticeable at K/H, and negligible at M/L, is expected to affect the Sb 5$p$-V 3$d$ hybridization at the interface.

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

1 major / 1 minor

Summary. The manuscript reports scanning photoemission spectromicroscopy (SPEM) measurements comparing the electronic band structures of Cs- and Sb-terminated surfaces of the kagome superconductor CsV₃Sb₅. The Cs-terminated surface shows bands closer to bulk expectations, while the Sb-terminated surface exhibits substantial modifications near the K/H Brillouin zone point. Below the CDW transition temperature the termination contrast decreases, yet the Sb 5p band on the Cs-terminated region displays increasing spatial inhomogeneity; this is interpreted as arising from out-of-plane Sb disorders and as relevant to CDW-induced band folding along Γ-A. The authors conclude that the less inhomogeneous Cs termination is preferable for interfaces, while noting that residual inhomogeneity (significant at Γ/A, noticeable at K/H, negligible at M/L) may still affect Sb 5p-V 3d hybridization.

Significance. If the reported spatial maps hold, the work supplies direct spectromicroscopic evidence of termination-dependent electronic inhomogeneity in a kagome superconductor, with potential implications for interface engineering in superconducting devices. The experimental approach provides spatially resolved intensity and dispersion data referenced to standard Brillouin zone points and the known CDW temperature, offering a concrete basis for comparing surface quality without reliance on fitted parameters or self-referential predictions.

major comments (1)
  1. [Abstract, final paragraph] Abstract, final paragraph: the interpretive claim that 'the inhomogeneity of the Sb 5p band would be related to disorders of the out-of-plane Sb' and is 'relevant for the band folding along Γ-A with the charge density wave' lacks direct structural support; SPEM maps electronic intensity and dispersion but supplies no atomic-position or defect-type information, leaving the causal link to out-of-plane Sb disorder (as opposed to surface reconstruction, adsorbates, or CDW domains) untested. This step is load-bearing for the interface-suitability recommendation.
minor comments (1)
  1. [Abstract] Abstract: quantitative measures of inhomogeneity (e.g., standard deviations, spatial correlation lengths, or error bars on band-position shifts) and details of data-processing steps are absent, which would improve clarity of the observational claims.

Simulated Author's Rebuttal

1 responses · 0 unresolved

We thank the referee for the constructive review. The single major comment concerns the strength of an interpretive claim in the abstract; we address it directly below and agree that a revision is warranted.

read point-by-point responses

  1. Referee: [Abstract, final paragraph] Abstract, final paragraph: the interpretive claim that 'the inhomogeneity of the Sb 5p band would be related to disorders of the out-of-plane Sb' and is 'relevant for the band folding along Γ-A with the charge density wave' lacks direct structural support; SPEM maps electronic intensity and dispersion but supplies no atomic-position or defect-type information, leaving the causal link to out-of-plane Sb disorder (as opposed to surface reconstruction, adsorbates, or CDW domains) untested. This step is load-bearing for the interface-suitability recommendation.

    Authors: We agree that the original phrasing presents the connection as more definitive than warranted by the SPEM data alone. The manuscript infers a possible link from the temperature-dependent increase in inhomogeneity on the Cs-terminated surface (which tracks the CDW transition) together with the known out-of-plane Sb positions in the crystal structure, but no direct structural or defect imaging is provided. We will revise the abstract (and corresponding sentences in the main text) to read that the inhomogeneity 'may be related to disorders of the out-of-plane Sb' and 'could be relevant for the band folding along Γ-A'. The interface recommendation rests on the measured lower spatial inhomogeneity of the Cs termination relative to the Sb termination, which is independent of the precise microscopic origin of the residual inhomogeneity. revision: yes

Circularity Check

0 steps flagged

No circularity: purely experimental mapping with no derivations or self-referential predictions

full rationale

The paper reports SPEM intensity maps, band dispersions, and spatial variations at fixed Brillouin zone points (Γ/A, K/H, M/L) and temperatures relative to the known CDW transition. No equations, fitted parameters, predictions, or derivations appear in the abstract or described content. The interpretive sentence linking Sb 5p inhomogeneity to out-of-plane Sb disorder is a qualitative suggestion, not a load-bearing derivation that reduces to its own inputs by construction. All observations are reported against external references (Brillouin zone labels, established CDW temperature) with no self-citation chains or ansatz smuggling. This meets the default expectation of a non-circular experimental report.

Axiom & Free-Parameter Ledger

0 free parameters · 1 axioms · 0 invented entities

The work is an experimental surface study relying on standard assumptions of photoemission spectroscopy; no free parameters, new entities, or ad-hoc axioms are introduced in the abstract.

axioms (1)
  • domain assumption Scanning photoemission microscopy maps local occupied electronic states with spatial resolution sufficient to distinguish Cs- and Sb-terminated regions.
    Core assumption enabling the contrast and inhomogeneity claims; invoked throughout the abstract.

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