Impurity effects on the anisotropic s-wave superconductor of the interlayer pair tunneling mechanism

Yunkyu Bang

doi:10.1103/PhysRevB.52.1279

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Impurity effects on the anisotropic s-wave superconductor of the interlayer pair tunneling mechanism

Yunkyu Bang

DOI 10.1103/PhysRevB.52.1279 · Physical Review B

T1

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Abstract

We study the effects of nonmagnetic impurities in the interlayer pair tunneling mechanism for an anisotropic s-wave (ASW) superconductor proposed by Anderson et al. using the self-consistent T-matrix approximation. We found that the impurity effects on this particular model are quite different from those of the conventional ASW model of the BCS-type pairing. It shows a much stronger suppression of Tc upon doping with nonmagnetic impurities than in the conventional ASW pairing state. Moreover, the minimum-energy gap does not monotonically grow with increasing impurity concentration but instead it quickly shrinks. We also show that the temperature dependence of the gap anisotropy ratio, R(T)=Δmax(T)/Δmin(T) increases with increasing temperature which has a similar trend with a recent experiment by Ma et al.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
YBa2Cu3O7 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown