Si-29 nuclear magnetic resonance spectra and relaxation in epsilon-FeSi

Corti M., Fanciulli M., Tabak F.

JOURNAL OF APPLIED PHYSICS, vol.87, no.9, pp.6280-6282, 2000 (SCI-Expanded) identifier

  • Publication Type: Article / Article
  • Volume: 87 Issue: 9
  • Publication Date: 2000
  • Doi Number: 10.1063/1.372679
  • Journal Name: JOURNAL OF APPLIED PHYSICS
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Page Numbers: pp.6280-6282
  • Hacettepe University Affiliated: No

Abstract

The magnetic properties of epsilon-FeSi are studied by Si-29 nuclear magnetic resonance spectra and spin-lattice relaxation, at different magnetic fields, up to 15 T. For T greater than or equal to 200 K, an asymmetric central line with a satellite-like structure is observed, having a width linearly increasing with the field and a shift proportional to the magnetic susceptibility. Below 200 K, a progressive broadening of the central line is detected on cooling, indicating an inhomogeneous distribution of local magnetization. The spin-lattice relaxation, measured across the spectrum follows a law of the form T(1)(-1)proportional to (KT)-T-2, with K corresponding to the shift of the different isocromates. The results are discussed in the light of the spin-fluctuations theory for exchange-enhanced semiconductors. (C) 2000 American Institute of Physics. [S0021-8979(00)52608-5].