Electrical resistivity and thermopower of Y1-xPrxCo2 Compounds

International Conference on Strongly Correlated Electron Systems 2014

Uchima, K.^1 ; Teruya, A.^2 ; Takaesu, Y.^1 ; Akamine, H.^2 ; Kakihana, M.^2 ; Tomori, K.^2 ; Uejo, T.^2 ; Nakamura, A.^2 ; Hedo, M.^3 ; Nakama, T.^3 ; Yagasaki, K.^3 ; Burkov, A.T.^4

General Education, Okinawa Christian Junior College, Nishihara, Okinawa

903-0207, Japan^1

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

903-0213, Japan^2

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

903-0213, Japan^3

A. F. Ioffe Physical-Technical Institute, Russian Academy of Sciences, Sankt-Petersburg

194021, Russia^4

关键词: Critical composition;    Heavy rare earths;    Inhomogeneous distribution;    Light rare earths;    Pressure dependence;    Residual resistivity;    Temperature decrease;    Temperature range;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/592/1/012044/pdf
DOI  :  10.1088/1742-6596/592/1/012044

来源: IOP

【 摘 要 】

Electrical resistivity ρ and thermopower S of the pseudo-binary compounds of Y1-xPrxCo2have been measured in the temperature range between 2 and 300 K under magnetic fields up to 10 T, together with the pressure measurements of ρ and S in Y0.4Pr0.6Co2. The Curie temperature decreases with decreasing x, and vanishes at the critical composition xc≈ 0.4, where the residual resistivity attains a maximum value. The Curie temperature and the residual resistivity of Y0.4Pr0.6Co2show the same pressure dependence as those of the heavy-rare-earth based compounds. These behaviors of ρ and S indicate the inhomogeneous distribution of the Co 3d magnetization. The magnetoresistance of the light-rare earth Y1-xPrxCo2system is negative in the whole range of x, except for x =0 and 1, which is a characteristic behavior related with magnetic state and magnitude of the effective field acting on the Co 3d subsystem.