Heavy-electron behavior in single-crystal YbNi2B2C

被引:80
作者
Yatskar, A
Budraa, NK
Beyermann, WP
Canfield, PC
Budko, SL
机构
[1] AMES LAB, AMES, IA 50011 USA
[2] IOWA STATE UNIV, AMES, IA 50011 USA
关键词
D O I
10.1103/PhysRevB.54.R3772
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
We have measured the magnetic susceptibility, specific heat, and electrical resistivity on single crystals of the intermetallic borocarbide YbNi2B2C. An enhanced linear contribution is observed in the specific heat with a Sommerfeld coefficient of 530 mJ/mol K-2, indicative of a heavy-electron system with a Kondo temperature similar to 10 K. The magnetic susceptibility, which is anisotropic and Curie-Weiss-like at high temperature, is also consistent with our interpretation of a strongly correlated ground state at low temperatures and crystal-electric-field excitations at higher temperatures. At T=1.8 K, the Wilson ratio is determined to be: 0.85 using the high-temperature effective moment. The resistivity shows a quadratic temperature dependence below 1.5 K with a T-2 coefficient of 1.2 mu Omega cm K-2. Unlike the other members of the series RNi(2)B(2)C (R=Y. Gd-Lu), YbNi2B2C does not order above our lowest measurement temperature of 0.34 K. The suppression of superconductivity in YbNi2B2C is consistent with a significantly enhanced hybridization between the conduction electrons and the 4f states.
引用
收藏
页码:R3772 / R3775
页数:4
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