• Letter

Modified Curie-Weiss law for jeff magnets

Ying Li, Stephen M. Winter, David A. S. Kaib, Kira Riedl, and Roser Valentí
Phys. Rev. B 103, L220408 – Published 17 June 2021
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Abstract

In spin-orbit-coupled magnetic materials, the usually applied Curie-Weiss law can break down. This is due to potentially sharp temperature dependence of the local magnetic moments. We therefore propose a modified Curie-Weiss formula suitable for analysis of experimental susceptibility. We show for octahedrally coordinated materials of d5 filling that the Weiss constant obtained from the improved formula is in excellent agreement with the calculated Weiss constant from microscopic exchange interactions. Reanalyzing the measured susceptibility of several Kitaev candidate materials with the modified formula resolves apparent discrepancies between various experiments regarding the magnitude and anisotropies of the underlying magnetic couplings.

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  • Received 3 March 2021
  • Accepted 20 May 2021

DOI:https://doi.org/10.1103/PhysRevB.103.L220408

©2021 American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied Physics

Authors & Affiliations

Ying Li1,2,*, Stephen M. Winter3,†, David A. S. Kaib2, Kira Riedl2, and Roser Valentí2,‡

  • 1MOE Key Laboratory for Nonequilibrium Synthesis and Modulation of Condensed Matter, School of Physics, Xi'an Jiaotong University, Xi'an 710049, China
  • 2Institut für Theoretische Physik, Goethe-Universität Frankfurt, Max-von-Laue-Strasse 1, 60438, Frankfurt am Main, Germany
  • 3Department of Physics and Center for Functional Materials, Wake Forest University, North Carolina 27109, USA

  • *yingli1227@xjtu.edu.cn
  • winters@wfu.edu
  • valenti@itp.uni-frankfurt.de

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Issue

Vol. 103, Iss. 22 — 1 June 2021

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