Journal of Research Institute of Science and Technology, College of Science and Technology, Nihon University
Online ISSN : 2185-4181
Print ISSN : 1884-8702
ISSN-L : 1884-8702
LETTER
Spin-orbit Dilution Effects on the Magnetism of Spin-orbit Frustrated Spinel GeCo2O4
Ryotaro AGATASyota TAKITATakashi ISHIKAWATadataka WATANABE
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JOURNAL OPEN ACCESS

2014 Volume 2014 Issue 131 Pages 131_11-131_14

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Abstract
We investigated magnetic properties of spinel oxides Ge(Co1-xMgx)2O4 with x = 0 ~ 0.5 to study the spin-orbit dilution effects on the magnetism of spin-orbit frustrated spinel GeCo2O4. We discovered that the magnetic moment per single Co2+ ion is decreased with increasing nonmagnetic Mg2+ ion concentration, which indicates the spin-orbit decoupling caused by the spin-orbit dilution. Additionally, small-amount substitution of Mg2+ for Co2+ causes the rapid increase of the positive Weiss temperature indicating the enhancement of ferromagnetic interactions, while the Mg2+ substitution suppresses the antiferromagnetic ordering resulting in the appearance of spin glass behavior. The present results suggest that the spin-orbit dilution causes the spin-orbit decoupling and the reinforcement of ferromagnetic frustration in GeCo2O4.
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© 2014 Nihon University Research Institute of Science and Technology
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