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Strain engineering of the magnetic multipole moments and anomalous Hall effect in pyrochlore iridate thin films

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Title
Strain engineering of the magnetic multipole moments and anomalous Hall effect in pyrochlore iridate thin films
Author(s)
Woo Jin Kim; Taekoo Oh; Jeongkeun Song; Eun Kyo Ko; Yangyang Li; Junsik Mun; Bongju Kim; Jaeseok Son; Zhuo Yang; Yoshimitsu Kohama; Miyoung Kim; Bohm-Jung Yang; Tae Won Noh
Publication Date
2020-07
Journal
SCIENCE ADVANCES, v.6, no.29, pp.eabb1539
Publisher
AMER ASSOC ADVANCEMENT SCIENCE
Abstract
ⓒ 2020 American Association for the Advancement of Science The recent observation of the anomalous Hall effect (AHE) without notable magnetization in antiferromagnets has suggested that ferromagnetic ordering is not a necessary condition. Thus, recent theoretical studies have proposed that higher-rank magnetic multipoles formed by clusters of spins (cluster multipoles) can generate the AHE without magnetization. Despite such an intriguing proposal, controlling the unconventional AHE by inducing these cluster multipoles has not been investigated. Here, we demonstrate that strain can manipulate the hidden Berry curvature effect by inducing the higher-rank cluster multipoles in spin-orbit-coupled antiferromagnets. Observing the large AHE on fully strained antiferromagnetic Nd2Ir2O7 thin films, we prove that strain-induced cluster T-1-octupoles are the only source of observed AHE. Our results provide a previously unidentified pathway for generating the unconventional AHE via strain-induced magnetic structures and establish a platform for exploring undiscovered topological phenomena via strain in correlated materials
URI
https://pr.ibs.re.kr/handle/8788114/7731
DOI
10.1126/sciadv.abb1539
ISSN
2375-2548
Appears in Collections:
Center for Correlated Electron Systems(강상관계 물질 연구단) > 1. Journal Papers (저널논문)
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