Impurity scattering in a d-wave superconductor

Mi Ae Park; M. H. Lee; Yong Jihn Kim

doi:10.1142/s0217984997000888

Impurity scattering in a d-wave superconductor

Mi Ae Park, M. H. Lee, Yong Jihn Kim

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2 Scopus citations

Abstract

The influence of (non-magnetic and magnetic) impurities on the transition temperature of a d-wave superconductor is studied anew within the framework of BCS theory. Pairing interaction decreases linearly with the impurity concentration. Accordingly T_c suppression is proportional to the (potential or exchange) scattering rate, 1/τ, due to impurities. The initial slope versus 1/τ is found to depend on the superconductor contrary to Abrikosov-Gor'kov type theory. Near the critical impurity concentration T_c drops abruptly to zero. Because the potential scattering rate is generally much larger than the exchange scattering rate, magnetic impurities will also act as non-magnetic impurities as far as the T_c decrease is concerned. The implication for the impurity doping effect in high T_c superconductors is also discussed.

Original language	English (US)
Pages (from-to)	719-726
Number of pages	8
Journal	Modern Physics Letters B
Volume	11
Issue number	16-17
DOIs	https://doi.org/10.1142/s0217984997000888
State	Published - Jul 20 1997
Externally published	Yes

ASJC Scopus subject areas

Statistical and Nonlinear Physics
Condensed Matter Physics

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AU - Lee, M. H.

AU - Kim, Yong Jihn

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N2 - The influence of (non-magnetic and magnetic) impurities on the transition temperature of a d-wave superconductor is studied anew within the framework of BCS theory. Pairing interaction decreases linearly with the impurity concentration. Accordingly Tc suppression is proportional to the (potential or exchange) scattering rate, 1/τ, due to impurities. The initial slope versus 1/τ is found to depend on the superconductor contrary to Abrikosov-Gor'kov type theory. Near the critical impurity concentration Tc drops abruptly to zero. Because the potential scattering rate is generally much larger than the exchange scattering rate, magnetic impurities will also act as non-magnetic impurities as far as the Tc decrease is concerned. The implication for the impurity doping effect in high Tc superconductors is also discussed.

AB - The influence of (non-magnetic and magnetic) impurities on the transition temperature of a d-wave superconductor is studied anew within the framework of BCS theory. Pairing interaction decreases linearly with the impurity concentration. Accordingly Tc suppression is proportional to the (potential or exchange) scattering rate, 1/τ, due to impurities. The initial slope versus 1/τ is found to depend on the superconductor contrary to Abrikosov-Gor'kov type theory. Near the critical impurity concentration Tc drops abruptly to zero. Because the potential scattering rate is generally much larger than the exchange scattering rate, magnetic impurities will also act as non-magnetic impurities as far as the Tc decrease is concerned. The implication for the impurity doping effect in high Tc superconductors is also discussed.

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Impurity scattering in a d-wave superconductor

Abstract

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