Zn-site Substitution Effect in YbCo2Zn20

International Conference on Strongly Correlated Electron Systems 2016

Kobayashi, Riki^1 ; Takamura, Haruki^2 ; Higa, Yasuyuki^2 ; Ikeda, Yoichi^3,4 ; Matsubayashi, Kazuyuki^5,6 ; Uwatoko, Yoshiya^6 ; Yoshizawa, Hideki^3 ; Aso, Naofumi^1

Faculty of Science, University of the Ryukyus, Nishihara, Okinawa

903-0213, Japan^1

Graduate School of Engineering and Science, University of the Ryukyus, Nishihara, Okinawa

903-0213, Japan^2

Neutron Science Laboratory, Institute for Solid State Physics, University of Tokyo, Ibaraki, Tokai

319-1106, Japan^3

Institute for Materials Research, Tohoku University, Sendai

980-8577, Japan^4

Graduate School of Informatics and Engineering, University of Electro-Communications, Tokyo

182-8585, Japan^5

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

277-8581, Japan^6

关键词: Chemical pressures;    Cu substitutions;    Electrical resistivity measurements;    Lower temperatures;    Magnetization measurements;    Quantum critical points;    Substitution effect;    X-values;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/807/1/012009/pdf
DOI  :  10.1088/1742-6596/807/1/012009

来源: IOP

【 摘 要 】

We have investigated the substitution effect of YbCo2(Zn1-xTx)20(T = Cu, Ga, and Cd) systems by using the experiments of X-ray powder diffraction (XRPD), specific heat, magnetic susceptibility, magnetization, and electrical resistivity in order to find out a material that approaches a quantum critical point by chemical pressure. The XRPD and electrical resistivity measurements clarify that the Cu-substitution makes the lattice constants shrink and keeps the magnetic electrical resistivity high, while the Ga- and the Cd-substitution show opposite relation of the Cu-substitution. However, we could not detect clear substitution effect in the specific heat, magnetic susceptibility, and magnetization measurements of Cu-substitution system within our experiments. It is necessary that to study the Cu-substitution samples that have higher x value at lower temperature.