Magnetic Properties of the Au-Al-Yb Approximant under Hydrostatic Pressure

13th International Conference on Quasicrystals

Matsukawa, Shuya^1 ; Deguchi, Kazuhiko^1 ; Imura, Keiichiro^1 ; Ishimasa, Tsutomu^2 ; Sato, Noriaki K.^1

Department of Physics, Graduate School of Science, Nagoya University, Nagoya

464-8602, Japan^1

Division of Applied Physics, Graduate School of Engineering, Hokkaido University, Sapporo

060-8628, Japan^2

关键词: AC Magnetic susceptibility;    Critical pressures;    Linear susceptibility;    Low temperatures;    Nonlinear susceptibilities;    Ordered state;    Quantum criticality;    Short-range ordered;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/809/1/012013/pdf
DOI  :  10.1088/1742-6596/809/1/012013

来源: IOP

【 摘 要 】

We report on ac magnetic susceptibility measurements of the Au-Al-Yb approximant under pressure. It is known that the approximant shows unconventional quantum criticality at the critical pressure Pc∼ 2 GPa, and further that the magnetic ordered state emerges at a low temperature (Tg∼ 100 mK) for P > Pc. We nd that the nonlinear susceptibility shows a peak around the temperature Tgat which the linear susceptibility peaks. We also nd that Tgincreases with frequency of the modulation eld. From these results, we suggest that the magnetic ordered state of the approximant below Tgis a spin-glass-like short-range ordered state.