Thursday, June 23, 2005, 2:30 pm — Building 510, Room 2-95
We report nuclear magnetic resonance (NMR) data in the new heavy fermion superconductor PuCoGa5 (Tc=18.5K) in the normal and superconducting states. Measurements of the Knight shift and the nuclear spin lattice relaxation rate in the superconducting state show a spin-singlet with
lines of nodes in the gap function, and our calculations indicate that the data are consistent with a strong-coupling d-wave gap function with Delta kB Tc=4. In the normal state, the temperature dependence of the spin
lattice relaxation rate suggests the presence of antiferromagnetic correlations, and scales with Tc in the same manner as in other heavy fermion superconductors, as well as the high temperature superconductor, YBa2Cu3O7. Our results suggest that a universal tunable magnetic pairing mechanism may be operative in all materials with functional elements of both localized and itinerant electrons.
Hosted by: Markus Hucker
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