Temperature dependent local inhomogeneity and magnetic moments of (Li1−xFex)OHFeSe superconductors

G. Tomassucci, L. Tortora, G. M. Pugliese, F. Stramaglia, L. Simonelli, C. Marini, Kensei Terashima, T. Wakita, Shinya Ayukawa, T. Yokoya, Kazutaka Kudo, Minoru Nohara, T. Mizokawa, N. L. Saini

Research output: Contribution to journalArticlepeer-review

Abstract

We have combined the extended X-ray absorption fine structure (EXAFS) and X-ray emission spectroscopy (XES) to investigate the local structure and the local iron magnetic moments of (Li1−xFex)OHFeSe (x∼0.2) superconductors. The local structure, studied by Fe K-edge EXAFS measurements, is found to be inhomogeneous that is characterized by different Fe-Se bond lengths. The inhomogeneous phase exhibits a peculiar temperature dependence with lattice anomalies in the local structural parameters at the critical temperature Tc (36 K) and at the spin density wave (SDW) transition temperature TN (130 K). Fe Kβ XES shows iron to be in a low spin state with the local Fe magnetic moment evolving anomalously as a function of temperature. Apart from a quantitative measurement of the local structure of (Li1−xFex)OHFeSe, providing direct evidence of nanoscale inhomogeneity, the results provide further evidence of the vital role that the coupled electronic, lattice and magnetic degrees of freedom play in the iron-based superconductors.

Original languageEnglish
Pages (from-to)6684-6692
Number of pages9
JournalPhysical Chemistry Chemical Physics
Volume25
Issue number9
DOIs
Publication statusPublished - Feb 2 2023

ASJC Scopus subject areas

  • General Physics and Astronomy
  • Physical and Theoretical Chemistry

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