Orbital Glass State of the Nearly Metallic Spinel Cobalt Vanadate

Strain, magnetization, dielectric relaxation, and unpolarized and polarized neutron diffraction measurements were performed to study the magnetic and structural properties of spinel Co_{1-x}V_{2+x}O_{4}. The strain measurement indicates that, upon cooling, ΔL/L in the order of ∼10^{-4} starts increa...

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Bibliographic Details
Published in:Physical review letters 2016-01, Vol.116 (3), p.037201-037201, Article 037201
Main Authors: Koborinai, R, Dissanayake, S E, Reehuis, M, Matsuda, M, Kajita, T, Kuwahara, H, Lee, S-H, Katsufuji, T
Format: Article
Language:English
Subjects:
CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY
Cooling
Dielectric constant
Ferrimagnetism
Magnetic properties
Magnetization
Neutron diffraction
Orbitals
Spinel
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Summary:Strain, magnetization, dielectric relaxation, and unpolarized and polarized neutron diffraction measurements were performed to study the magnetic and structural properties of spinel Co_{1-x}V_{2+x}O_{4}. The strain measurement indicates that, upon cooling, ΔL/L in the order of ∼10^{-4} starts increasing below T_{C}, becomes maximum at T_{max}, and then decreases and changes its sign at T^{*}. Neutron measurements indicate that a collinear ferrimagnetic order develops below T_{C} and upon further cooling noncollinear ferrimagnetic ordering occurs below T_{max}. At low temperatures, the dielectric constant exhibits a frequency dependence, indicating slow dynamics. These results indicate the existence of an orbital glassy state at low temperatures in this nearly metallic frustrated magnet.
ISSN:0031-9007
1079-7114
DOI:10.1103/physrevlett.116.037201