Impurity-induced gap renormalization in anisotropic superconductors:: Mixed-state specific heat of La2-xSrx(Cu1-yZny)O4 and Y(Ni1-xPtx)2B2C

被引：37

作者：

Nohara, M ^{[1
]}

Suzuki, H ^{[1
]}

Mangkorntong, N ^{[1
]}

Takagi, H ^{[1
]}

机构：

[1] Univ Tokyo, Dept Adv Mat Sci, Tokyo 1130033, Japan

来源：

PHYSICA C | 2000年 / 341卷

关键词：

D O I：

10.1016/S0921-4534(00)01259-4

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

The effect of nonmagnetic impurity on the superconducting gap is examined on La2-xSrx(Cu1-yZny)O-4 and Y(Ni1-xPtx)(2)B2C from the T and H dependence of the electronic specific heat C-e(T, H) at low temperatures. In La2-xSrxCuO4, impurity scattering leads to an appearance of a finite density of states (DOS) at the Fermi energy, consistent with d-wave pairing state with nonmagnetic impurity scattering in the unitarity limit. In contrast, nonmagnetic impurity scattering in YNi2B2C leads to a smearing of the gap anisotropy and the opening of a gap in the DOS over the whole Fermi surface, though C-e(T, H) for pure compound suggests the presence of anisotropic gap. This indicates YNi2B2C is a highly anisotropic s-wave superconductor.

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页码：2177 / 2180

页数：4

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