Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2010-10-07
J.Phys.Soc.Jpn. 80 (2011) 043601
Physics
Condensed Matter
Strongly Correlated Electrons
5 pages, 4 figures
Scientific paper
10.1143/JPSJ.80.043601
Elastic properties of the filled skutterudite compound SmOs$_4$Sb$_{12}$ have been investigated by ultrasonic measurements. The elastic constant $C_{11}(\omega)$ shows two ultrasonic dispersions at $\sim$15 K and $\sim$53 K for frequencies $\omega$ between 33 and 316 MHz, which follow a Debye-type formula with Arrhenius-type temperature-dependent relaxation times, and remain unchanged even with applied magnetic fields up to 10 T. The corresponding activation energies were estimated to be $E_2$ = 105 K and $E_1$ = 409 K, respectively. The latter, $E_1$, is the highest value reported so far in the Sb-based filled skutterudites. The presence of magnetically robust ultrasonic dispersions in SmOs$_4$Sb$_{12}$ implies a possibility that an emergence of a magnetically insensitive heavy fermion state in this system is associated with a novel local charge degree of freedom which causes the ultrasonic dispersion.
Akatsu Mitsuhiro
Amitsuka Hiroshi
Araki Koji
Baumbach Ryan E.
Goto Terutaka
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