Linear magnetoelectric effect as a signature of long-range collinear antiferromagnetic ordering in the frustrated spinel CoAl2O4

Ghara, Somnath ; Ter-Oganessian, N. V. ; Sundaresan, A. (2017) Linear magnetoelectric effect as a signature of long-range collinear antiferromagnetic ordering in the frustrated spinel CoAl2O4 Physical Review B: Condensed Matter and Materials Physics, 95 (9). ISSN 2469-9950

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Official URL: http://doi.org/10.1103/PhysRevB.95.094404

Related URL: http://dx.doi.org/10.1103/PhysRevB.95.094404

Abstract

The ground state of the frustrated A -site magnetic spinel CoAl2O4 has been a controversial issue whether it is a collinear antiferromagnetic ordering or a spiral spin-liquid state, as the ratio of the two competing interactions J2/J1 lies close to the boundary between these two ground states. Here we address the magnetic ground state in CoAl2O4 with different amounts of Co2+/ Al3+ site disorder from the study of magnetoelectric effect and Monte Carlo simulations. CoAl2O4 with low site disorder exhibits a linear magnetoelectric effect below the magnetic ordering temperature. With increasing disorder, the magnetoelectric effect is suppressed and the sample with 14 % disorder exhibits a spin glass behavior without the magnetoelectric effect. Monte Carlo simulations support the experimental findings and suggest that the site disorder suppresses long-range antiferromagnetic order and induces a spin glass state. Since the linear magnetoelectric effect requires a long-range magnetic ordering, we suggest that the ground state of CoAl2O4 with low site disorder is a collinear antiferromagnet.

Item Type:Article
Source:Copyright of this article belongs to American Physical Society.
ID Code:119994
Deposited On:21 Jun 2021 07:47
Last Modified:21 Sep 2021 09:34

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