Small $T_1^{-1}$ coherence peak near $T_c$ in unconventional superconductors

Abstract

It is usually believed that a coherence peak just below T${}_c$ in the nuclear spin lattice relaxation rate T${}_1^{-1}$ in superconducting materials is a signature of conventional s-wave pairing. In this paper we demonstrate that any unconventional superconductor obeying BCS pure-case weak-coupling theory should show a small T${}_1^{-1}$ coherence peak near T${}_c$, generally with a height between 3 and 15 percent greater than the normal state T${}_1^{-1}$ at T${}_c$. It is largely due to impurity effects that this peak has not commonly been observed.

4 pages, 5 figures

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Cited by in corpus (3)

• Existence of Hebel-Slichter peak in unconventional kagome superconductors
• The ratio of normal state to superconducting state of spin lattice relaxation rate of unconventional superconductors
• Effect of Impurities Scattering Potential on NMR relaxation rate in impure d-wave superconductors