Low Frequency Spin Dynamics Of Itinerant Triangular-Lattice NaxCoO2-jH2O

摘要

59Co NQR studies of low frequency spin fluctuations of double-layer hydrated triangular-lattice superconductors and nonsupereonductors NaxCoO2->'H2O are presented. For all the samples, 59Co nuclear spin-lattice relaxation rates H59Ti indicated non-Korringa behaviors in the normal states. For the nonsuperconductor, l/597"i indicated a magnetic critical slowing down effect. The triangular-lattice superconductivity emerges near a magnetic instability.