Theory of Knight Shift and Spin-Lattice Relaxation Rates of Pu-115

Details Theory of Knight Shift and Spin-Lattice Relaxation Rates of Pu-115 Theory of Knight Shift and Spin-Lattice Relaxation Rates of Pu-115

2005-12-20

arxiv.org/abs/cond-mat/0512509v1

Physics

Condensed Matter

Superconductivity

Presented at the MRS 2005 Fall Meeting, Boston, MA (Nov. 28 - Dec. 2, 2005), to be published in "Materials Research Society -

Scientific paper

We calculated the Knight shift and spin-lattice relaxation rates of Pu-115 compounds assuming d-wave superconductivity in the presence of strong impurity scattering. We discuss the implications for recent measurements of the spin-lattice relaxation rate in the Pu-115 compound PuRhGa5 by Sakai and coworkers [J. Phys. Soc. Jpn. 74, 1710 (2005)] and present a prediction for the corresponding Knight shift. In addition, we noticed a significant round-off of the spin-lattice relaxation rate 1/T1 just above the superconducting transition temperature that is not observed in the sister compound PuCoGa5. It appears that in PuRhGa5 superconductivity is mediated by spin fluctuations, too. This provides additional support to the scenario of superconducting pairing mediated by spin fluctuations in the Pu-115 compounds similar to the Ce-115 compounds and the high-temperature copper-oxide superconductors.

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