Strong coupling effects on the upper critical field of the heavy-fermion superconductor UBe13
Strong coupling effects on the upper critical field of the heavy-fermion superconductor UBe13
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重费米子超导体UBe13上临界场的强耦合效应
DOI：
10.1007/bf00755113
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发表时间：
1996
影响因子：
2
通讯作者：
J. Flouquet
中科院分区：
文献类型：
--
作者：
F. Thomas;B. Wand;T. Lühmann;P. Gegenwart;G. Stewart;F. Steglich;J. Brison;A. Buzdin;L. Glémot;J. Flouquet
采用极低噪声电阻率测量方法研究了优质UBe13单晶的上临界场dhc2 (T)。它显示了-45 T/K的大而有限的斜率，异常的温度依赖性，拐点atT/TC ~ 0.5和hc2 (0) = 14 T的大饱和极限forT→0。hc2 (T)的完全温度依赖性可以用一个简单的强耦合超导体模型来描述，假设完全泡利限制和在低温下出现非均匀超导态（FFLO态）。
The upper critical fieldHc2(T) of a high quality single crystal of UBe13 is studied with very low noise resistivity measurements. It shows a large but finite slope of —45 T/K, an unusual temperature dependence with an inflexion point atT/TC∼ 0.5 and a large saturated limit forT→ 0 ofHc2(0) = 14 T. The complete temperature dependence ofHc2(T) can be described by a simple model of strong coupling superconductor, assuming a full Pauli limitation and the occurence of a non-uniform superconducting state (FFLO state) at low temperature.