Orbital Glass State of the Nearly Metallic Spinel Cobalt Vanadate

R. Koborinai, S. E. Dissanayake, M. Reehuis, M. Matsuda, T. Kajita, H. Kuwahara, S. H. Lee, T. Katsufuji

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26 Scopus citations

Abstract

Strain, magnetization, dielectric relaxation, and unpolarized and polarized neutron diffraction measurements were performed to study the magnetic and structural properties of spinel Co1-xV2+xO4. The strain measurement indicates that, upon cooling, ΔL/L in the order of ∼10-4 starts increasing below TC, becomes maximum at Tmax, and then decreases and changes its sign at T∗. Neutron measurements indicate that a collinear ferrimagnetic order develops below TC and upon further cooling noncollinear ferrimagnetic ordering occurs below Tmax. 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.

Original languageEnglish
Article number037201
JournalPhysical Review Letters
Volume116
Issue number3
DOIs
StatePublished - Jan 19 2016

Funding

The work at Waseda University was partially supported by JSPS KAKENHI Grant No. 25287090. Research at UVA was supported by the U.S. Department of Energy, Office of Basic Energy Sciences, Division of Materials Sciences and Engineering, under Award No. DE-FG02-07ER46384. We acknowledge the support of the National Institute of Standards and Technology, U.S. Department of Commerce, in providing the neutron research facilities for powder diffraction measurements used in this work. This research at ORNL’s High Flux Isotope Reactor was sponsored by the Scientific User Facilities Division, Office of Basic Energy Sciences, U.S. Department of Energy.

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