Nuclear spin-lattice relaxation rate in the D+iD superconducting state: implications for CoO superconductor

Details Nuclear spin-lattice relaxation rate in the D+iD superconducting state: implications for CoO superconductor Nuclear spin-lattice relaxation rate in the D+iD superconducting state: implications for CoO superconductor

2003-07-21

arxiv.org/abs/cond-mat/0307510v2

Physics

Condensed Matter

Strongly Correlated Electrons

5 pages, 4 figures, minor changes

Scientific paper

10.1103/PhysRevB.68.212504

We calculated the nuclear spin-lattice relaxation rate $1/T_1$ for the D+iD superconducting state with impurities. We found that small amount of unitary impurities quickly produces the residual density of states inside the gap. As a result, the T-linear behavior in 1/T$_1$ is observed at low temperatures. Our results show that the D+iD pairing symmetry of the superconducting state of Na$_{0.35}$CoO$_{2} \cdot y$H$_2$ O is compatible with recent $^{59}$Co 1/T$_1$ experiments of several groups.

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