Ultrasound velocity measurements in orbital-degenerate frustrated spinel MgV2O4

International Conference on Strongly Correlated Electron Systems 2014

Ishikawa, T.^1 ; Watanabe, T.^1 ; Hara, S.^2 ; Islam, A.T.M.N.^3 ; Wheeler, E.M.^3 ; Lake, B.^3

Department of Physics, College of Science and Technology (CST), Nihon University, Chiyoda, Tokyo

101-8308, Japan^1

Department of Physics, Chuo University, Bunkyo, Tokyo

101-8324, Japan^2

Helmholtz Zentrum Berlin GmbH, Berlin

D-14109, Germany^3

关键词: Antiferromagnetic phase transition;    High purity;    Measurements of;    Orbital fluctuations;    Paramagnetic phase;    Spin cluster;    Spin-glass-like behaviors;    Temperature dependence;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/592/1/012107/pdf
DOI  :  10.1088/1742-6596/592/1/012107

来源: IOP

【 摘 要 】

Ultrasound velocity measurements of the orbital-degenerate frustrated spinel MgV2O4are performed in the disorder-free high-purity single crystal which exhibits successive structural and antiferromagnetic phase transitions, and in the disorder-introduced single crystal which exhibits spin-glass-like behavior. The measurements reveal coexisting two types of anomalous temperature dependence of the elastic moduli in the cubic paramagnetic phase: Curie-type softening with decreasing temperature, and softening with a characteristic minimum with decreasing temperature. These elastic anomalies should respectively originate from the coexisting orbital fluctuations and spin-cluster excitations.