Anisotropic superconductors containing transition-metal impurities: Local spin fluctuations

I. M. Tang

doi:10.1103/PhysRevB.33.7575

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Anisotropic superconductors containing transition-metal impurities: Local spin fluctuations

I. M. Tang

DOI 10.1103/PhysRevB.33.7575 · Physical Review B

T1

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Abstract

The effects of transition-metal (TM) impurities on the transition temperature of an anisotropic superconductor when the TM impurities give rise to local spin fluctuations (LSF’s) are studied. The effective electron-electron interaction between the Cooper-pair electrons is taken to be the sum of a separable anisotropic electron-phonon potential and the repulsive Coulomb potential existing between the electrons. The multiplicative renormalization technique is used to treat the Coulomb repulsion between the d electrons of opposite spins which localize about an impurity site. It is found that the LSF’s influence the anisotropic superconductors in two ways. They cause a decrease in the anisotropy and an increase in the Coulomb pseudopotential. Numerical calculations of the decrease in Tc are carried out using parameters appropriate to the dilute AlMn superconductors.

Source-reported materials — not catalogue approval

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