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arxiv: 1907.00342 · v2 · pith:G6C7CAVJnew · submitted 2019-06-30 · ❄️ cond-mat.mtrl-sci

The X-ray photoemission and Co K -Edge X-ray absorption of Ba2CoWO6

Dhiraj Jha , A. K. Himanshu , Bijay K Singh , Dinesh Shukla , Uday Kuma , Ravi Kumar , Kaustava Bhattacharyya , A. B. Shinde
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P. S. R. Krishna Alo Dutta T. P. Sinha Rajyavardhan Ray
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Pith reviewed 2026-05-25 12:53 UTC · model grok-4.3

classification ❄️ cond-mat.mtrl-sci
keywords double perovskiteneutron powder diffractionX-ray absorption spectroscopyX-ray photoemission spectroscopyBa2CoWO6crystal structuremagnetic orderinglocal environment
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The pith

Ba2CoWO6 adopts a face-centered cubic structure with no long-range magnetic order detected between 6 K and 300 K.

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

The paper establishes the crystal structure of the double perovskite Ba2CoWO6 as face-centered cubic with space group Fm3m using neutron powder diffraction collected from 6 K to 300 K. No evidence of long-range magnetic ordering appears across this temperature window. X-ray photoemission spectroscopy together with Co K-edge X-ray absorption near-edge and extended fine-structure analysis supplies information on the electronic state and local atomic coordination around the cobalt ions, while ultraviolet-visible spectroscopy supplies an estimate of the optical band gap.

Core claim

Neutron powder diffraction determines that Ba2CoWO6 crystallizes in the face-centered cubic space group Fm3m and exhibits no long-range magnetic order from 6 K to 300 K. Complementary X-ray photoemission, XANES, and EXAFS measurements at the Co K-edge, calibrated against Co foil, characterize the local electronic and structural environment of cobalt, while UV-vis data provide the band-gap value.

What carries the argument

Neutron powder diffraction for average structure and magnetic order combined with Co K-edge XAFS and XPS for local Co environment.

If this is right

  • The average crystal structure remains cubic down to 6 K with cobalt ions occupying the expected octahedral sites.
  • Absence of magnetic Bragg peaks implies the compound stays without long-range order at least to 6 K.
  • XANES edge position and EXAFS oscillations constrain the local Co-O and Co-W distances and the formal valence of cobalt.
  • The measured optical gap sets an energy scale for electronic transitions in this material.

Where Pith is reading between the lines

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

  • If the local Co environment matches the average cubic structure, the material may host frustrated or short-range spin correlations rather than conventional order.
  • Comparison of the band gap with other double perovskites could test whether tungsten substitution systematically widens the gap relative to simpler cobalt oxides.
  • Extending neutron measurements to lower temperatures or applying muon spin rotation would provide an independent check on the magnetic ground state.

Load-bearing premise

The neutron data collected between 6 K and 300 K are sufficient to rule out long-range magnetic order and the chosen reference spectra allow reliable interpretation of the cobalt oxidation state and coordination.

What would settle it

Appearance of additional magnetic Bragg peaks in neutron diffraction below 6 K or a Co K-edge position that deviates from the calibration provided by the reference compounds.

Figures

Figures reproduced from arXiv: 1907.00342 by A. B. Shinde, A. K. Himanshu, Alo Dutta, Bijay K Singh, Dhiraj Jha, Dinesh Shukla, Kaustava Bhattacharyya, P. S. R. Krishna, Rajyavardhan Ray, Ravi Kumar, T. P. Sinha, Uday Kuma.

Figure 1
Figure 1. Figure 1: XPS spectra of BCoW: (a) X-ray photoelectron spectra of BCoW in the energy window of 0 to 900 eV. The core level spectrum of (b) Co 2p, (c) Ba 3d, and (d) W 4f states [PITH_FULL_IMAGE:figures/full_fig_p004_1.png] view at source ↗
read the original abstract

The structural, electronic and optical properties of cubic double perovskite BaCoWO6 have been studied. Neutron powder diffraction data is collected on this sample from 6K to 300K. The crystal structure is face centered cubic, space group being Fm3m (No. 225). We did not find evidence for long range magnetic ordering in this system in this temperature range. The band-gap is estimated using Uv-vis spectroscopy. The Co-K edge X-ray absorption (XAFS) spectra of Ba2CoWO6 was analysed together with those Co-foil, which was used as reference compounds. X-ray photoemission spectroscopy (XPS), X-ray absorption near edge structure (XANES) and extended X-ray absorption fine structure (EXAFS) studies give the insight of the electronic and structural information on the Co local environment for Ba2CoWO6.

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 reports neutron powder diffraction (NPD) data on Ba2CoWO6 collected from 6 K to 300 K, determining a face-centered cubic structure in space group Fm3m with no evidence of long-range magnetic order. UV-vis spectroscopy is used to estimate the band gap. Co K-edge XANES, EXAFS, and XPS measurements, with Co foil as reference, are presented to characterize the local electronic and structural environment of Co.

Significance. If the NPD analysis robustly excludes magnetic order and the XAFS interpretation is properly calibrated, the work adds to the experimental characterization of double-perovskite cobaltates. The negative result on magnetism and the local-environment data could be useful for comparison with related compounds, but the current presentation provides insufficient detail to assess the strength of these claims.

major comments (2)
  1. [Neutron powder diffraction] Neutron powder diffraction section: the claim of no long-range magnetic ordering from 6 K to 300 K is not supported by any description of Rietveld refinements performed with and without a magnetic model, any extracted upper limit on the ordered moment, or explicit checks for propagation vectors that could produce intensity only on nuclear Bragg positions.
  2. [X-ray absorption (XANES/EXAFS)] X-ray absorption section: the Co K-edge XANES and EXAFS analysis relies solely on Co foil (Co^0) as reference; this is insufficient to calibrate edge position or phase shifts for Co in an oxide environment, where Co^{2+}/Co^{3+} standards with matching coordination are required to support statements about the Co local environment.
minor comments (2)
  1. [Abstract] The abstract contains an internal inconsistency in compound formula (BaCoWO6 vs. Ba2CoWO6); the title uses Ba2CoWO6.
  2. [Crystal structure] Space group is written as Fm3m; standard notation is Fm-3m.

Simulated Author's Rebuttal

2 responses · 0 unresolved

We thank the referee for their careful review and constructive comments, which highlight areas where additional detail will strengthen the manuscript. We address each major comment below and will revise the manuscript to incorporate the requested information.

read point-by-point responses

  1. Referee: Neutron powder diffraction section: the claim of no long-range magnetic ordering from 6 K to 300 K is not supported by any description of Rietveld refinements performed with and without a magnetic model, any extracted upper limit on the ordered moment, or explicit checks for propagation vectors that could produce intensity only on nuclear Bragg positions.

    Authors: We agree that the current description lacks the quantitative details needed to fully support the absence of long-range magnetic order. In the revised manuscript we will add Rietveld refinements performed both with and without a magnetic model, report an upper limit on any ordered moment consistent with the data, and explicitly discuss checks for possible propagation vectors (including those that would contribute intensity only to nuclear Bragg positions). revision: yes

  2. Referee: X-ray absorption section: the Co K-edge XANES and EXAFS analysis relies solely on Co foil (Co^0) as reference; this is insufficient to calibrate edge position or phase shifts for Co in an oxide environment, where Co^{2+}/Co^{3+} standards with matching coordination are required to support statements about the Co local environment.

    Authors: We acknowledge that reliance on Co foil alone is insufficient for calibrating the edge position and phase shifts in an oxide environment. In the revised manuscript we will include additional reference spectra from appropriate Co^{2+} and Co^{3+} oxide standards with coordination environments comparable to the double-perovskite structure to support the XANES and EXAFS interpretation. revision: yes

Circularity Check

0 steps flagged

No circularity: purely experimental report with direct measurements only

full rationale

The manuscript reports crystal structure from NPD data, absence of magnetic Bragg peaks from 6-300 K, band gap from UV-vis, and local Co environment from XPS/XANES/EXAFS using external reference compounds. No equations, models, fitted parameters renamed as predictions, or self-citations appear in the provided text. All claims are presented as direct observations or comparisons to independent standards (Co foil), with no derivation chain that reduces to the paper's own inputs by construction. This matches the default expectation for experimental papers lacking any predictive or theoretical component.

Axiom & Free-Parameter Ledger

0 free parameters · 0 axioms · 0 invented entities

Only the abstract is available; no equations, derivations, or detailed methods are present to identify free parameters, axioms, or invented entities.

pith-pipeline@v0.9.0 · 5747 in / 996 out tokens · 38632 ms · 2026-05-25T12:53:17.655105+00:00 · methodology

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