Evidence for the coexistence of an anisotropic superconducting gap and nonlocal effects in the nonmagnetic superconductor LuNi2B2C.
Evidence for the coexistence of an anisotropic superconducting gap and nonlocal effects in the nonmagnetic superconductor LuNi2B2C.
复制标题
非磁性超导体 LuNi2B2C 中各向异性超导能隙和非局域效应共存的证据。
DOI：
10.1103/physrevlett.92.237002
复制
发表时间：
2003
影响因子：
8.6
通讯作者：
P. Canfield
中科院分区：
文献类型：
--
作者：
T. Park;E. Chia;M. Salamon;E. Bauer;I. Vekhter;J. Thompson;E. Choi;Heon;Sung;P. Canfield
研究了LuNi_2B_2C的热容C（p）（α）与场角的关系，揭示了一种反常的无序效应。对于纯样品，C（p）（alpha）表现出场H（alpha=0）的四倍变化。然而，<110>当μ（0）H>1 T时，轻微无序的样品沿沿着出现异常的次级极小值，导致在2 K和1.5 T时出现八重模式。讨论了超导带隙各向异性和非局域效应共存的反常模式。
A study of the dependence of the heat capacity C(p)(alpha) on the field angle in LuNi2B2C reveals an anomalous disorder effect. For pure samples, C(p)(alpha) exhibits a fourfold variation as the field H (alpha=0). A slightly disordered sample, however, develops anomalous secondary minima along <110> for mu(0)H>1 T, leading to an eightfold pattern at 2 K and 1.5 T. The anomalous pattern is discussed in terms of coexisting superconducting gap anisotropy and nonlocal effects.