Gd-155,Gd-157 NMR study of Gd-Ni intermetallic compounds

V L B de Jesus, I S Oliveira, Peter Charles Riedi, A P Guimaraes

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11 Citations (Scopus)

Abstract

The spin-echo NMR technique was used to study the magnetic properties of the following intermetallic compounds of the Gd-Ni series: Gd2Ni17, GdNi5, GdNi3, GdNi2 and GdNi, with Gd-155 and Gd-157 nuclei as local probes. These compounds have different crystal structures and order ferri- or ferromagnetically. The NMR measurements were performed at 4.2 and 1.5 K. The NMR spectra were compared to computed line positions obtained from the diagonalization of the complete hyperfine Hamiltonian. The RKKY contribution to the hyperfine field was computed for Gd2Ni17 and GdNi3, and differences in the values of B-hf at the two sites of Gd, of the order, respectively, of 18 and 6 T, were thus justified. An intense quadrupole interaction was observed at the Gd sites in the compounds GdNi5, Gd2Ni17, and in one of the sites of the compound GdNi3 ; in all these cases, the values of V-zz are of the order of 10(22) V/m(2). The NMR results in GdNi are consistent with a direction of magnetization along the b-axis for this compound. The present study presents the first systematics of hyperfine interactions in Gd-Ni compounds. (C) 2000 Elsevier Science B.V. All rights reserved.

Original languageEnglish
Pages (from-to)125-137
Number of pages13
JournalJournal of Magnetism and Magnetic Materials
Volume212
Issue number1-2
DOIs
Publication statusPublished - Mar 2000

Keywords

  • intermetallic compounds
  • NMR - spin echo
  • hyperfine fields - magnetic
  • quadrupolar interactions

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