Hydrogen-induced reduction of electric field gradient in La(2)Fe(14)BHx studied by NMR on (139)LA

J Bartolome, M D Kuz'min, C Kapusta, P C Riedi, M Ellouze, P l'Heritier

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)

Abstract

The La-139 NMR spin-echo spectra of La2Fe14BHx are reported. Since lanthanum has no 4f electrons, the observed quadrupole splittings are directly proportional to the lattice part of the electric field gradient, V-zz(lat). This quantity decreases as the content of interstitial hydrogen x grows. To describe the fall-off of V-zz(lat), a dimensionless function f(2)(x) is introduced, normalised so that f(2)(0) = 1. Analysis of the new and earlier published data obtained by several experimental techniques demonstrates that the reduction of both the second-order crystal field parameter AN and the lattice electric field gradient V-zz(lat) is described by the same function f(2)(x) in all R2Fe14BHx. The only distinction that needs to be made is between R being a light and a heavy rare earth. (C) 2003 Elsevier Ltd. All rights reserved.

Original languageEnglish
Pages (from-to)331-334
Number of pages4
JournalSolid State Communications
Volume129
DOIs
Publication statusPublished - Feb 2004

Keywords

  • permanent magnets
  • magnetic anisotropy
  • hydrogenated intermetallic compounds
  • electric field gradient
  • INTERMETALLIC COMPOUNDS
  • GD NUCLEI

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