Portal de Periódicos da CAPES

Determination of the valence in Sm-based filled skutterudite compounds

2006; Elsevier BV; Volume: 383; Issue: 1 Linguagem: Inglês

10.1016/j.physb.2006.03.083

1873-2135

Masaichiro Mizumaki, Satoshi Tsutsui, Hajime Tanida, Tomoya Uruga, Daisuke Kikuchi, Hitoshi Sugawara, Hideyuki Sato,

Solid-state spectroscopy and crystallography

We have measured XAS spectra at Sm L3-edge in four Sm-based filled skutterudite compounds. The only XAS spectrum of SmOs4Sb12 around the Sm L3-edge exhibit a double peak structure that is the characteristic feature of the mixed valence system due to Sm2+ and Sm3+ states whereas those of others exhibit a single peak structure characteristic in Sm3+ systems. The average valence of Sm ions in SmOs4Sb12 was 2.83. We conclude that the presence of a non-magnetic Sm2+ state correlates with the unusual heavy fermion state in SmOs4Sb12.