Source capture
Authors Aleksandr V. Korolev, Evgeny F. Talantsev
arXiv / Publisher https://arxiv.org/abs/2602.19282
PDF https://arxiv.org/pdf/2602.19282
Relevance score 4.498
Primary category cond-mat.supr-con
Published 2026-02-26
Research paradigm Theoretical
Sample form Unknown

Summary

This study points out that Zhu et al., when measuring the superconducting volume fraction of pressurized Ruddlesden-Popper nickelate La4Ni3O10, employed a previously unreported calculation equation, leading to a significant overestimation of the results. By reanalyzing the original data published by Zhu et al. using standard methods for calculating superconducting magnetic moments, the authors found that the superconducting volume fraction is only 51% to 59%, rather than the 81% to 86% reported by Zhu et al. Upon examining the equation and its derivation provided by Zhu et al., the authors discovered that the equation mistakenly used sample geometry parameters in its calculation, resulting in an approximately two-fold overestimate of the volume proportion occupied by the superconducting phase. Using a hypothetical sample as an example, the authors demonstrate that even if the superconducting phase actually accounts for only 50%, this equation would still yield a result close to 100%. Consequently, this error affects all previously reported superconducting volume fraction data for Ruddlesden-Popper nickelates, necessitating a re-evaluation of these conclusions.

Materials

Methods

Keywords

Highlights

  • Identifies a systematic error in the calculation of superconducting volume fraction in pressurized nickelates.
  • Demonstrates with a hypothetical example that even a 50% superconducting fraction would yield near 100% using the incorrect equation.

Conclusions

  • The equation used by Zhu et al. to calculate superconducting volume fraction in La4Ni3O10 is incorrect.
  • The correct calculation yields a superconducting volume fraction of 51-59%, not 81-86% as reported.
  • The error arises from using an incorrect formula that effectively doubles the volume fraction.
  • This error affects all previously reported superconducting volume fractions in Ruddlesden-Popper nickelates.

Main claims

  • The equation used by Zhu et al. overestimates the superconducting volume fraction in La4Ni3O10 by nearly twofold
    • Evidence: From abstract: 'the proposed equation and procedure are incorrect, and that this equation results in multiple overestimations of the superconducting volume fraction in the sample',Calculations show ZFC ratio 51-59% vs reported 81-86%

Workflow

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