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Autori: B. Andraka, A. Ross, and C. R. Rotundu
Editorial: IOP, Journal of Physics: Condensed Matter, 23, p.405601, 2011.
The magnetic susceptibility of Ce1-xLaxOs4Sb12, with x~0.2, exhibits a pronounced maximum at Tm=80 K. This Tm coincides roughly with the temperature below which a small gap, believed to be a hybridization gap, is observed in spectroscopic measurements in undoped
CeOs4Sb12. However, a similar anomaly, at a lower temperature of 50 K, is observed in LaOs4Sb12. Furthermore, there is a monotonic variation of Tm with x, for x > 0.2, suggesting
the same origin of the two anomalies and undermining a simple hybridization gap interpretation of the susceptibility of Ce1-xLaxOs4Sb12 alloys, with x < 1. A possibility of the hybridization gap opening, induced by freezing out of local phonons, strongly coupled with electronic degrees of freedom, is discussed.
Cuvinte cheie: heavy fermion