Magnetic-field enhancement of 63Cu and 17O relaxation rates in the mixed state of YBa2Cu4O8 observation of fermi-liquid state in the vortex cores

Guo qing Zheng, Yoshio Kitaoka, Kunisuke Asayama, Yasuharu Kodama

Research output: Contribution to journalArticle

9 Citations (Scopus)

Abstract

The 63Cu and 17O nuclear spin-lattice relaxation rates in YBa2Cu4O8 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/T1 for both 63Cu and 17O are enhanced by the magnetic field. Most strikingly, in a high field of 11 T, 63(1/T1) and 17(1/T1) decrease in proportion to the temperature, T, below T=15 K and T=10 K, respectively. The magnetic-field dependence of 1/T1 is shown to be dominated by spin diffusion to the vortex cores, implying that the electronic state in the cores is characterized by the T1T=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 Tc.

Original languageEnglish
Pages (from-to)169-175
Number of pages7
JournalPhysica C: Superconductivity and its applications
Volume227
Issue number1-2
DOIs
Publication statusPublished - Jun 20 1994
Externally publishedYes

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Energy Engineering and Power Technology
  • Electrical and Electronic Engineering

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