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

M. Nohara; H. Suzuki; N. Mangkorntong; H. Takagi

doi:10.1016/S0921-4534(01)00191-5

Impurity-induced gap modification in anisotropic superconductors: Mixed-state specific heat of La_2-xSr_x(Cu_1-yZn_y)O₄ and Y(Ni_1-xPt_x)₂B₂C

M. Nohara, H. Suzuki, N. Mangkorntong, H. Takagi

Research output: Contribution to journal › Article › peer-review

2 Citations (Scopus)

Abstract

We have examined the effect of nonmagnetic impurity on the superconducting gap of La_2-xSr_x(Cu_1-yZn_y)O₄ and Y(Ni_1-xPt_x)₂B₂C from the mixed-state specific heat C(T,H). In La_2-xSr_xCuO₄, impurity scattering leads to an appearance of a finite density of states (DOS) at the Fermi level, consistent with d-wave pairing state with nonmagnetic impurity scattering. 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(T, H) for pure compound suggests the presence of anisotropic gap. This indicates YNi₂B₂C is a highly anisotropic s-wave superconductor.

Original language	English
Pages (from-to)	42-45
Number of pages	4
Journal	Physica C: Superconductivity and its applications
Volume	357-360
DOIs	https://doi.org/10.1016/S0921-4534(01)00191-5
Publication status	Published - 2001
Externally published	Yes

Keywords

Borocarbide
Impurity
LSCO
Specific heat
Superconducting gap

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Condensed Matter Physics
Energy Engineering and Power Technology
Electrical and Electronic Engineering

Access to Document

10.1016/S0921-4534(01)00191-5

Cite this

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

abstract = "We have examined the effect of nonmagnetic impurity on the superconducting gap of La2-xSrx(Cu1-yZny)O4 and Y(Ni1-xPtx)2B2C from the mixed-state specific heat C(T,H). In La2-xSrxCuO4, impurity scattering leads to an appearance of a finite density of states (DOS) at the Fermi level, consistent with d-wave pairing state with nonmagnetic impurity scattering. 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(T, H) for pure compound suggests the presence of anisotropic gap. This indicates YNi2B2C is a highly anisotropic s-wave superconductor.",

keywords = "Borocarbide, Impurity, LSCO, Specific heat, Superconducting gap",

author = "M. Nohara and H. Suzuki and N. Mangkorntong and H. Takagi",

year = "2001",

doi = "10.1016/S0921-4534(01)00191-5",

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pages = "42--45",

journal = "Physica C: Superconductivity and its Applications",

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T1 - Impurity-induced gap modification in anisotropic superconductors

T2 - Mixed-state specific heat of La2-xSrx(Cu1-yZny)O4 and Y(Ni1-xPtx)2B2C

AU - Nohara, M.

AU - Suzuki, H.

AU - Mangkorntong, N.

AU - Takagi, H.

PY - 2001

Y1 - 2001

N2 - We have examined the effect of nonmagnetic impurity on the superconducting gap of La2-xSrx(Cu1-yZny)O4 and Y(Ni1-xPtx)2B2C from the mixed-state specific heat C(T,H). In La2-xSrxCuO4, impurity scattering leads to an appearance of a finite density of states (DOS) at the Fermi level, consistent with d-wave pairing state with nonmagnetic impurity scattering. 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(T, H) for pure compound suggests the presence of anisotropic gap. This indicates YNi2B2C is a highly anisotropic s-wave superconductor.

AB - We have examined the effect of nonmagnetic impurity on the superconducting gap of La2-xSrx(Cu1-yZny)O4 and Y(Ni1-xPtx)2B2C from the mixed-state specific heat C(T,H). In La2-xSrxCuO4, impurity scattering leads to an appearance of a finite density of states (DOS) at the Fermi level, consistent with d-wave pairing state with nonmagnetic impurity scattering. 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(T, H) for pure compound suggests the presence of anisotropic gap. This indicates YNi2B2C is a highly anisotropic s-wave superconductor.

KW - Borocarbide

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KW - LSCO

KW - Specific heat

KW - Superconducting gap

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