High Pressure Measurements of the Resistivity of β-YbAlB4

International Conference on Strongly Correlated Electron Systems 2014

Tomita, T.^1 ; Kuga, K.^1 ; Uwatoko, Y.^1 ; Nakatsuji, S.^1

Institute for Solid State Physics, University of Tokyo, Kashiwanoha, Chiba, Kashiwa

277-8581, Japan^1

关键词: Ambient pressures;    Critical pressures;    Heavy fermion compounds;    Heavy fermion systems;    High pressure measurements;    High quality single crystals;    Pressure-induced magnetic order;    Quantum criticality;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/592/1/012019/pdf
DOI  :  10.1088/1742-6596/592/1/012019

来源: IOP

【 摘 要 】

The electric resistivity ρ(T) under hydrostatic pressure up to 8 GPa was measured above 2 K using a high-quality single crystal of the Yb-based heavy fermion system β-YbAlB4. We found pressure-induced magnetic ordering above the critical pressure Pc≈ 2.4 GPa. This phase transition temperature TMis enhanced with pressure and reaches 30 K at a pressure of 8 GPa, which is the highest transition temperature for the Yb-based heavy fermion compounds. In contrast, the resistivity is insensitive to pressure below Pcand exhibits the T-linear behavior in the temperature range between 2 and 20 K. Our results indicate that quantum criticality for β-YbAlB4is also located near Pcin addition to the ambient pressure.