title: Orbital Glass State of the Nearly Metallic Spinel Cobalt Vanadate.
abstract: 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.
authors: Department of Physics, Waseda University, Tokyo 169-8555, Japan.
authors: R
authors: R
authors: Koborinai
authors: Department of Physics, University of Virginia, Charlottesville, Virginia 22904, USA.
authors: S E
authors: SE
authors: Dissanayake
authors: Helmholtz-Zentrum für Materialien und Energie, 14109 Berlin, Germany.
authors: M
authors: M
authors: Reehuis
authors: Quantum Condensed Matter Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA.
authors: M
authors: M
authors: Matsuda
authors: Department of Physics, Waseda University, Tokyo 169-8555, Japan.
authors: T
authors: T
authors: Kajita
authors: Department of Physics, Sophia University, Tokyo 102-8554, Japan.
authors: H
authors: H
authors: Kuwahara
authors: Department of Physics, University of Virginia, Charlottesville, Virginia 22904, USA.
authors: S-H
authors: SH
authors: Lee
authors: Department of Physics, Waseda University, Tokyo 169-8555, Japan.|Kagami Memorial Research Institute for Materials Science and Technology, Waseda University, Tokyo 169-0051, Japan.
authors: T
authors: T
authors: Katsufuji