Pair breaking and bound states in disordered superconductors

A.K. Chattopadhyay; R.A. Klemm; D. Sa

doi:10.1088/0953-8984/14/31/101

Pair breaking and bound states in disordered superconductors

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Abstract

We study the effects of inhomogeneous pairing interactions and impurities in short-coherence-length superconductors. Within the Born approximation, the effects of pairing disorder and magnetic impurities are identical. The T-matrices for pairing disorder sites with and without an impurity give rise to bound states within the BCS (Bardeen-Cooper-Schrieffer) gap, consistent with scanning tunnelling microscopy results on Bi₂Sr₂CaCu₂O_8+δ with Zn or Ni impurities.

Original language	English
Pages (from-to)	L577-L582
Number of pages	6
Journal	Journal of Physics: Condensed Matter
Volume	14
Issue number	31
Early online date	24 Jul 2002
DOIs	https://doi.org/10.1088/0953-8984/14/31/101
Publication status	Published - 12 Aug 2002

Keywords

approximation theory
bismuth compounds
additives doping
Eigenvalues and eigenfunctions
fermi level
hamiltonians
impurities
mathematical models
matrix algebra
parameter estimation
scanning tunneling microscopy
stoichiometry
vectors
magnetic impurities
oxide superconductors

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10.1088/0953-8984/14/31/101

superconductivityFinal published version, 106 KB

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AU - Klemm, R.A.

AU - Sa, D.

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AB - We study the effects of inhomogeneous pairing interactions and impurities in short-coherence-length superconductors. Within the Born approximation, the effects of pairing disorder and magnetic impurities are identical. The T-matrices for pairing disorder sites with and without an impurity give rise to bound states within the BCS (Bardeen-Cooper-Schrieffer) gap, consistent with scanning tunnelling microscopy results on Bi2Sr2CaCu2O8+δ with Zn or Ni impurities.

KW - approximation theory

KW - bismuth compounds

KW - additives doping

KW - Eigenvalues and eigenfunctions

KW - fermi level

KW - hamiltonians

KW - impurities

KW - mathematical models

KW - matrix algebra

KW - parameter estimation

KW - scanning tunneling microscopy

KW - stoichiometry

KW - vectors

KW - magnetic impurities

KW - oxide superconductors

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DO - 10.1088/0953-8984/14/31/101

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JO - Journal of Physics: Condensed Matter

JF - Journal of Physics: Condensed Matter

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ER -

Pair breaking and bound states in disordered superconductors

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