Portal de Periódicos da CAPES

The Mixed Valence States in the Unconventional Heavy Fermion Compound SmOs 4 Sb 12

2007; Physical Society of Japan; Volume: 76; Issue: 5 Linguagem: Inglês

10.1143/jpsj.76.053706

1347-4073

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

Inorganic Chemistry and Materials

The X-ray absorption spectra of the heavy fermion compounds SmFe 4 P 12 and SmOs 4 Sb 12 have been measured near the Sm L 3 -edge at selected temperatures below 300 K. The spectra show the valence of Sm ions in SmFe 4 P 12 to be trivalent between 14 and 300 K with no significant temperature dependence. In contrast, that in SmOs 4 Sb 12 is 2.83 at 300 K and shows a significant decrease below 150 K, indicating an important role of the nonmagnetic Sm 2+ ions in the heavy fermion state that are insensitive to an applied magnetic field.