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Chandan, De
원자제어 저차원 전자계 연구단
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Magnetoelectric effect in a single crystal of the frustrated spinel CoAl2 O4

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Title
Magnetoelectric effect in a single crystal of the frustrated spinel CoAl2 O4
Author(s)
Chandan De; Bag, Rabindranath; Singh, Surjeet; Fabelo, Oscar; Fernández-Díaz, Maria Teresa; Ter-Oganessian, N.V.; Sundaresan, A.
Publication Date
2021-03
Journal
Physical Review B, v.103, no.9
Publisher
American Physical Society
Abstract
© 2021 American Physical Society.The magnetic ground state of CoAl2O4 has been a controversial issue because the ratio of nearest- (J1) to next-nearest-neighbor (J2) exchange interactions in the diamond lattice is close to the boundary between a spiral spin liquid and a long-range ordered antiferromagnetic ground state. Recently, Ghara et al. reported a linear magnetoelectric effect in a polycrystalline CoAl2O4 and attributed it to a long-range magnetic order. However, the magnetic ground state and the easy axis anisotropy remained unsolved. Here we propose the easy magnetic axis direction by comparing the results of magnetoelectric measurements in a high-quality single crystal with phenomenological calculations. From the value of polarization ratio P||[1-10] measured under magnetic field applied along H||[1-10] and H||[001], we determined that the magnetic easy axis is along [111]. The single ion contribution of the magnetic ions located at the noncentrosymmetric environment is responsible for the magnetoelectric effect similar to that observed in other A-site magnetic spinel oxides, Co3O4, MnB2O4 (B=Al,Ga).
URI
https://pr.ibs.re.kr/handle/8788114/9756
DOI
10.1103/PhysRevB.103.094406
ISSN
2469-9950
Appears in Collections:
Center for Artificial Low Dimensional Electronic Systems(원자제어 저차원 전자계 연구단) > 1. Journal Papers (저널논문)
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