Suppression of superconductivity by two-channel Kondo impurities

K.-H. Luk; M. Jarrell; D. L. Cox

doi:10.1103/PhysRevB.50.15864

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Suppression of superconductivity by two-channel Kondo impurities

K.-H. Luk, M. Jarrell, D. L. Cox

DOI 10.1103/PhysRevB.50.15864 · Physical Review B

T1

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Abstract

We have performed a calculation on the change of the critical temperature Tc of a superconducting host with respect to the change of the concentration c of two-channel Kondo impurities in the limit of vanishing c. Tc suppressions are found for both spin-singlet flavor-triplet and spin-triplet flavor-singlet pairings for temperatures as low as TK/Tc0>1, where TK and Tc0 are the Kondo temperature and the critical temperature of the host in the absence of impurities, respectively. The suppression is much larger for the spin-singlet flavor-triplet pairing. We also found empirically that (∂Tc/∂c)c=0 can be expressed as a product of two functions g(TK/T) and f(λ0,ω0), where λ0 and ω0 are electron phonon coupling and Einstein frequency, respectively.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
Y1-xUxPd3 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown
Th1-xUxRu2Si2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown
La1-xCexCu2.2Si2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown