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PhysRevB.108.224410.pdf (3.29 MB)

Frustration relief and reorientation transition in the kagomelike dolerophanite Cu2OSO4

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journal contribution
posted on 2023-12-11, 10:22 authored by Amelia PantherAmelia Panther, Alexander A Tsirlin, Ioannis RousochatzakisIoannis Rousochatzakis

We present a theoretical study of dolerophanite Cu2OSO4, a layered kagomelike spin- ½ magnetic insulator that can be described either as a system of chains coupled through dimers or as a kagome lattice where every third spin is replaced by a ferromagnetic spin dimer. Building on insights from ab initio calculations, classical numerical minimizations, and semiclassical expansions, we arrive at a minimal microscopic description that accounts for the experimental data reported so far, including the nature of the magnetic order, the reported spin length, and the observed anisotropy. The latter arises by a peculiar competition between the antisymmetric (Dzyaloshinskii-Moriya) and the symmetric part of the exchange anisotropy, which gives rise to a two-step reorientation process involving two successive continuous phase transitions. In this paper, we uncover mechanisms stabilizing canted ferrimagnetic order in kagome systems and highlight strong magnetic anisotropy in the presence of dissimilar magnetic orbitals on crystallographically nonequivalent Cu sites. We also show how these anisotropy terms affect the spin-wave spectrum and how they can be tracked experimentally.

Funding

Detecting fractionalization in strongly correlated magnets

Engineering and Physical Sciences Research Council

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Deutsche Forschungsgemeinschaft—TRR 360— 492547816

National Science Foundation under Grant No. NSF PHY1748958

History

School

  • Science

Department

  • Physics

Published in

Physical Review B

Volume

108

Issue

22

Publisher

American Physical Society

Version

  • VoR (Version of Record)

Rights holder

© The Authors

Publisher statement

This is an Open Access Article. It is published by the American Physical Society under the Creative Commons Attribution 4.0 International Licence (CC BY). Full details of this licence are available at: https://creativecommons.org/licenses/by/4.0/

Acceptance date

2023-11-13

Publication date

2023-12-06

Copyright date

2023

ISSN

2469-9950

eISSN

2469-9969

Language

  • en

Depositor

Dr Ioannis Rousochatzakis. Deposit date: 8 December 2023

Article number

224410