### Session A9: Superconductivity: Thermodynamic and Doping Effects

8:00 AM–11:00 AM, Monday, March 5, 2007
Colorado Convention Center Room: Korbel 1D

Chair: Carmen Almasan, Kent State University

Abstract ID: BAPS.2007.MAR.A9.5

### Abstract: A9.00005 : Small T$^{-1}_{1}$ peak near T$_{c}$ in unconventional BCS superconductors

9:12 AM–9:24 AM

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#### Authors:

David Parker
(MPIPKS)

Stephan Haas
(USC Dept. of Physics and Astronomy)

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. We demonstrate that {\bf 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 value at T$_{c}$. It is due to impurity scattering, magnetic effects, gap anisotropy and other effects that this peak has not been commonly observed.

To cite this abstract, use the following reference: http://meetings.aps.org/link/BAPS.2007.MAR.A9.5