Impurity-induced gap renormalization 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(00)01259-4

Impurity-induced gap renormalization 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 › Conference article › peer-review

46 Citations (Scopus)

Abstract

The effect of nonmagnetic impurity on the superconducting gap is examined on La_2-xSr_x(Cu_1-yZn_y)O₄ and Y(Ni_1-xPt_x)₂B₂C from the T and H dependence of the electronic specific heat C_e(T, H) at low temperatures. In La_2-xSr_xCuO₄, 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.

Original language	English
Pages (from-to)	2177-2180
Number of pages	4
Journal	Physica C: Superconductivity and its applications
Volume	341-348 (IV)
DOIs	https://doi.org/10.1016/S0921-4534(00)01259-4
Publication status	Published - Nov 2000
Externally published	Yes
Event	International Conference on Materials and Mechanisms of Superconductivity High Temperature Superconductors VI - Houston, TX, USA Duration: Feb 20 2000 → Feb 25 2000

ASJC Scopus subject areas

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

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

abstract = "The effect of nonmagnetic impurity on the superconducting gap is examined on La2-xSrx(Cu1-yZny)O4 and Y(Ni1-xPtx)2B2C from the T and H dependence of the electronic specific heat Ce(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 Ce(T, H) for pure compound suggests the presence of anisotropic gap. This indicates YNi2B2C is a highly anisotropic s-wave superconductor.",

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

note = "Copyright: Copyright 2018 Elsevier B.V., All rights reserved.; International Conference on Materials and Mechanisms of Superconductivity High Temperature Superconductors VI ; Conference date: 20-02-2000 Through 25-02-2000",

year = "2000",

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doi = "10.1016/S0921-4534(00)01259-4",

language = "English",

volume = "341-348 (IV)",

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

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TY - JOUR

T1 - Impurity-induced gap renormalization in anisotropic superconductors

T2 - International Conference on Materials and Mechanisms of Superconductivity High Temperature Superconductors VI

AU - Nohara, M.

AU - Suzuki, H.

AU - Mangkorntong, N.

AU - Takagi, H.

PY - 2000/11

Y1 - 2000/11

N2 - The effect of nonmagnetic impurity on the superconducting gap is examined on La2-xSrx(Cu1-yZny)O4 and Y(Ni1-xPtx)2B2C from the T and H dependence of the electronic specific heat Ce(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 Ce(T, H) for pure compound suggests the presence of anisotropic gap. This indicates YNi2B2C is a highly anisotropic s-wave superconductor.

AB - The effect of nonmagnetic impurity on the superconducting gap is examined on La2-xSrx(Cu1-yZny)O4 and Y(Ni1-xPtx)2B2C from the T and H dependence of the electronic specific heat Ce(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 Ce(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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DO - 10.1016/S0921-4534(00)01259-4

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EP - 2180

JO - Physica C: Superconductivity and its Applications

JF - Physica C: Superconductivity and its Applications

Y2 - 20 February 2000 through 25 February 2000

ER -

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

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