Magnetic and Transport Properties of GdNi1-xCux

概要

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The thermal conductivity and electrical resistivity of GdCu measured in the range from 2 to 300 K indicated a temperature-dependent variation in the Lorenz numbers, which were found to take values of approximately $4\times 10^{-8}$ W $\Omega$/K2, implying that the Wiedemann–Franz law is valid for this compound. The thermoelectric power of GdCu with CsCl-type and FeB-type structures suggested that the main carrier of GdCu was a hole and that the carrier density changed with crystal-structure transformation. The specific heat measurements of GdNi1-xCux compounds with $x=0.0$, 0.1, 0.3, 0.35, 0.4, 0.45, 0.5, 0.6, 0.8, 0.9, and 1.0 revealed that the magnetic-phase transitions occurred at approximately 70 K for $x\leq 0.8$. The temperature dependence of magnetization indicated that the compounds with $x\leq 0.35$ were ferromagnetic, but those with $x\geq 0.4$ were antiferromagnetic. The magnetic entropy changes extracted from the magnetization versus temperature curves and the magnetization versus field curves were found to be consistent within the range of experimental errors for $x=0.0$, 0.35, and 0.6. The observed magnetic-entropy changes for the ferromagnetic compounds were larger than those for the antiferromagnetic compounds.
Published by the Japan Society of Applied Physics through the Institute of Pure and Applied Physicsの論文
2007-09-15