Anomalous specific heat behaviour in the quadrupolar Kondo system PrV2Al20

International Conference on Strongly Correlated Electron Systems 2014

Tsujimoto, M.^1 ; Matsumoto, Y.^1 ; Nakatsuji, S.^1,2

Institute for Solid State Physics, University of Tokyo, Kashiwa, Chiba, Japan^1

PRESTO, Japan Science and Technology Agency (JST), 4-1-8 Honcho Kawaguchi, Saitama

332-0012, Japan^2

关键词: Cooling process;    Exponential decays;    Heat capacity measurements;    High quality single crystals;    Ordered state;    Power-law dependences;    Residual resistivity ratios;    Very low temperatures;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/592/1/012023/pdf
DOI  :  10.1088/1742-6596/592/1/012023

来源: IOP

【 摘 要 】

We have measured the specific heat of PrV2Al20at very low temperatures, using high quality single crystals with the residual resistivity ratio ∼ 20. The high-quality single crystals exhibit clear double transitions at TQ= 0.75 K and T∗ = 0.65 K. These transitions are clearer and shift to higher temperature in higher quality single crystals. Besides, there was no hysteresis in those transitions in warming and cooling process of the heat capacity measurements. In the ordered state below T∗, the specific heat does not exhibit exponential decay, but T4power law dependence, indicating the gapless mode associated with the quadrupole and/or octupole degrees of freedom.