Long range antiferromagnetic order in a rocksalt high entropy oxide

Abstract

We report for the first time the magnetic structure of the high entropy oxide $(M{g}_{0.2}C{o}_{0.2}N{i}_{0.2}C{u}_{0.2}Z{n}_{0.2})O$ using neutron powder diffraction. This material exhibits a sluggish magnetic transition but possesses a long-range ordered antiferromagnetic ground state, as revealed by DC and AC magnetic susceptibility, elastic and inelastic neutron scattering measurements. The magnetic propagation wavevector is k=(1/2, 1/2, 1/2) based on the cubic structure Fm-3m, and the magnetic structure consists of ferromagnetic sheets in the (111) planes with spins antiparallel between two neighboring planes. Inelastic neutron scattering reveals strong magnetic excitations at 100 K that survive up to room temperature. This work demonstrates that entropy-stabilized oxides represent a unique platform to study long range magnetic order with extreme chemical disorder.

arXiv comment13 pages, 4 figures, supplemental material is upon request

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