High-temperature correlated spin dynamics in FeSi from Si-29 NMR relaxation

Corti, M; Aldrovandi, S; Fanciulli, M; Tabak, F

doi:10.1016/j.jmmm.2004.01.025

High-temperature correlated spin dynamics in FeSi from Si-29 NMR relaxation

Corti M., Aldrovandi S., Fanciulli M., Tabak F.

JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS, cilt.272, ss.112-113, 2004 (SCI-Expanded, Scopus)

Yayın Türü: Makale / Tam Makale
Cilt numarası: 272
Basım Tarihi: 2004
Doi Numarası: 10.1016/j.jmmm.2004.01.025
Dergi Adı: JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus
Sayfa Sayıları: ss.112-113
Hacettepe Üniversitesi Adresli: Hayır

Özet

Si-29 NMR measurements in FeSi up to 900 K are reported. For T less than or equal to 350 K the spin-lattice relaxation rate T-1(-1) and the Knight shift K-S display behaviors typical of gapped systems and track the homogeneous static susceptibility chi(T). In the high temperature range an unexpected effect is observed with chi(T) and K-S leveling around 500 K and then decreasing, while Gamma(1)(-1) continues to increase up to 900 K. Insights on the spin dynamics of Fermi-like carriers in strong correlation are derived. (C) 2004 Elsevier B.V. All rights reserved.