Magnetic Properties in the Normal State of LuNi2B2C Observed by 61Ni and 11B NMR

Kenji Ikushima, Hiroshi Yasuoka, Akira Ohno, Hidenori Takagi, R. J. Cava, J. J. Krajewski, W. F. Peck

Research output: Contribution to journalArticle

6 Scopus citations

Abstract

The 61Ni spin-lattice relaxation rate, 61T-11, and the Knight shift of a 91% 61Ni enriched sample of LuNi2B2C have been measured in the normal state. It was found that 61(T1T)-1 shows a Curie-Weiss like behavior, while the Knight shift has a slight temperature dependence. The hyperfine coupling constant is estimated to be 61A = -16 kOe/μB, which is an order of magnitude smaller than that due to the 3d-core-polarization mechanism. When the orbital term of the relaxation rate is given by the formula calculated for the tetragonal (D2d) symmetry at the 61Ni sites, much larger d-spin term than that expected from the Knight shift is obtained. The Korringa relation is also discussed on the assumption that the hyperfine coupling constant is reduced by a strong s-d admixture, and then the deviation from the Korringa relation for free electrons, K(α), is more than one. This result suggests the significance of the generalized susceptibility, χ(q), at finite wave vectors.

Original languageEnglish (US)
Pages (from-to)1130-1137
Number of pages8
JournalJournal of the Physical Society of Japan
Volume66
Issue number4
DOIs
StatePublished - Apr 1997
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

Keywords

  • Generalized susceptibility
  • Knight shift
  • Korringa relation
  • LuNiBC
  • NMR
  • Nuclear spin-lattice relaxation rate

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