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Compass impurity model of Tb substitution in Sr2IrO4

Long Zhang, Fa Wang, and Dung-Hai Lee
Phys. Rev. B 94, 161118(R) – Published 21 October 2016

Abstract

We show that upon Tb substitution the interaction between the magnetic moments on the impurity Tb4+ ion and its surrounding Ir4+ ions is described by a “compass” model, i.e., an Ising-like interaction favoring the magnetic moments across each bond to align along the bond direction. Such an interaction nucleates quenched magnetic vortices near the impurities and drives a reentrant transition out of the antiferromagnetic ordered phase at low temperatures, hence quickly suppressing the Néel temperature, consistent with the experiment [J. C. Wang et al., Phys. Rev. B 92, 214411 (2015)]. As a by-product, we propose that the compass model can be realized in ordered double perovskites composed of spin-orbital-coupled d5 ions and half-closed-shell f7 ions.

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  • Received 19 July 2016
  • Revised 25 September 2016

DOI:https://doi.org/10.1103/PhysRevB.94.161118

©2016 American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied Physics

Authors & Affiliations

Long Zhang1, Fa Wang1,2, and Dung-Hai Lee3,4

  • 1International Center for Quantum Materials, School of Physics, Peking University, Beijing 100871, China
  • 2Collaborative Innovation Center of Quantum Matter, Beijing 100871, China
  • 3Department of Physics, University of California, Berkeley, California 94720, USA
  • 4Materials Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA

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Issue

Vol. 94, Iss. 16 — 15 October 2016

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