Abstract
The 63Cu and 17O nuclear spin-lattice relaxation rates in YBa 2Cu 4O 8 have been measured in the temperature and magnetic field ranges of 1.4–270 K and 4.0–11 T, respectively. In the mixed state, 1/ T 1 for both 63Cu and 17O are enhanced by the magnetic field. Most strikingly, in a high field of 11 T, 63(1/ T 1) and 17(1/ T 1) decrease in proportion to the temperature, T, below T=15 K and T=10 K, respectively. The magnetic-field dependence of 1/ T 1 is shown to be dominated by spin diffusion to the vortex cores, implying that the electronic state in the cores is characterized by the T 1 T= const. law. This result indicates that the electronic state in the vortex cores is described in terms of the Fermi-liquid picture, in sharp contrast to the unusual properties above T c.
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