Magnetic Pair-Breaking in Y1-xHoxNi2B2C （x = 0, 0.25, 0.5, 0.75） Single Crystals

作     者：赵松睿 沈静琴 许祝安 Takeya H Hirata K 

作者机构：Department of Physics Zhejiang University Hangzhou 310027 National Institute for Materials Science 1-2-1 Sengen Tsukuba Ibaraki 305-0047 Japan 

出 版 物：《Chinese Physics Letters》 (中国物理快报（英文版）)

年 卷 期：2006年第23卷第4期

页      面：975-977页

核心收录：

学科分类：07[理学] 070205[理学-凝聚态物理] 08[工学] 080501[工学-材料物理与化学] 0805[工学-材料科学与工程（可授工学、理学学位）] 0703[理学-化学] 0702[理学-物理学] 

基　　金：Supported by the National Natural Science Foundation of China under Grant No 10225417  and National Basic Research Programme of China under Grant No 2006CB601003 

主　　题：ANTIFERROMAGNETIC SUPERCONDUCTOR HONI2B2C ORDER TRANSPORT METALS 

摘      要：Temperature-dependent resistivity and magnetic susceptibility were studied for quaternary borocarbide intermetallic compounds Y1-xHoxNi2B2C （x = 0, 0.25, 0.5, 0. 75）, which show coexistence of superconductivity with magnetism. In a normal state, the compounds exhibit conventional metallic behaviour. The Debye temperature θD is derived by fitting the temperature dependence of resistivity to the Bloch-Gruneisen expression, i.e. θD scales with M^-0.5 （M is the averaged atomic mass on the Y^3＋ site）, which means that the acoustic mode of the lattice vibrating spectrum is influenced by the Y^3＋ site atoms. Fitting the temperature-dependent magnetic susceptibility above TN to the Curie-Weiss law, effective magnetic moment μeff is deduced, and then de Gennes factor dG is calculated. It is found that as Ho content increases, μeff as well as dG increases and Tc decreases. Moreover, the decrease of Tc scales with dG, i.e., △Te ∝ -nI^2 N （EF ）dG, which is consistent with the prediction of the Abrikosov-Gor＇kov theory. We suggest that pair-breaking effect of magnetic Ho^3＋ ions. The significant impact on To. the depression of Tc could be mainly ascribed to the magnetic change of Debye temperature with Ho content may not have significant impact on Tc.