Magnetic-Field-Induced Dielectric Anomalies in Cobalt-Containing Garnets

Abbey J Neer; JoAnna Milam-Guerrero; Veronika A Fischer; Michelle Zheng; Nicole R Spence; Clayton Cozzan; Mingqiang Gu; James M Rondinelli; Craig M Brown; Brent C Melot

doi:10.1021/acs.inorgchem.1c03792

Magnetic-Field-Induced Dielectric Anomalies in Cobalt-Containing Garnets

Inorg Chem. 2022 Apr 11;61(14):5452-5458. doi: 10.1021/acs.inorgchem.1c03792. Epub 2022 Mar 28.

Affiliations

¹ Department of Chemistry, University of Southern California, Los Angeles, California 90089, United States.
² Materials Department, University California, Santa Barbara, California 93106, United States.
³ Department of Materials Science and Engineering, Northwestern University, Evanston, Illinois 60208, United States.
⁴ NIST Center for Neutron Research, Gaithersburg, Maryland 20899-8562, United States.

PMID: 35344655
DOI: 10.1021/acs.inorgchem.1c03792

Abstract

Here we present a comparative study of the magnetic and crystal chemical properties of two Co²⁺ containing garnets. CaY₂Co₂Ge₃O₁₂ (which has been reported previously) and NaCa₂Co₂V₃O₁₂ both exhibit the onset of antiferromagnetic order around 6 K as well as field-induced transitions around 7 and 10 T, respectively, that manifest as anomalies in the dielectric properties of the material. We perform detailed crystal-chemistry analyses and complementary density functional theory calculations to show that very minor changes in the local environment of the Co ions explain the differences in the two magnetic structures and their respective properties.