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

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

2006-08-31

arxiv.org/abs/cond-mat/0608701v1

Physics

Condensed Matter

Superconductivity

4 pages, 5 figures

Scientific paper

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.

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