Elastic properties of the Non-Fermi liquid metal $Ce Ru_4 Sb_{12}$ and the Dense Kondo semiconductor $Ce Os_4 Sb_{12}$

Yoshiki Nakanishi; Tomoyuki Kumagai; Masafumi Oikawa; Tomoaki Tanizawa; Masahito Yoshizawa; Hitoshi Sugawara; Hideyuki Sato

doi:10.1103/PhysRevB.75.134411

paper

Elastic properties of the Non-Fermi liquid metal $C e R u_{4} S b_{12}$ and the Dense Kondo semiconductor $C e O s_{4} S b_{12}$

arXiv:cond-mat/0609502 · doi:10.1103/PhysRevB.75.134411

Abstract

We have investigated the elastic properties of the Ce-based filled skutterudite antimonides CeRu $_{4}$ Sb $_{12}$ and CeOs $_{4}$ Sb $_{12}$ by means of ultrasonic measurements. CeRu $_{4}$ Sb $_{12}$ shows a slight increase around 130 K in the temperature dependence of the elastic constants $C$ $_{11}$ , ( $C$ $_{11}$ - $C$ $_{12}$ )/2 and $C$ $_{44}$ . No apparent softening toward low temperature due to a quadrupolar response of the 4 $f$ -electronic ground state of the Ce ion was observed at low temperatures. In contrast CeOs $_{4}$ Sb $_{12}$ shows a pronounced elastic softening toward low temperature in the longitudinal $C$ $_{11}$ as a function of temperature ( $T$ ) below about 15 K, while a slight elastic softening was observed in the transverse $C$ $_{44}$ below about 1.5 K. Furthermore, CeOs $_{4}$ Sb $_{12}$ shows a steep decrease around a phase transition temperature of 0.9 K in both $C$ $_{11}$ and $C$ $_{44}$ . The elastic softening observed in $C$ $_{11}$ below about 15 K cannot be explained reasonably only by the crystalline electric field effect. It is most likely to be responsible for the coupling between the elastic strain and the quasiparticle band with a small energy gap in the vicinity of Fermi level. The elastic properties and the 4 $f$ ground state of Ce ions in CeRu $_{4}$ Sb $_{12}$ and CeOs $_{4}$ Sb $_{12}$ are discussed from the viewpoint of the crystalline electric field effect and the band structure in the vicinity of Fermi level.

9 pages, 11 figures, regular paper

Elastic properties of the Non-Fermi liquid metal $C e R u_{4} S b_{12}$ and the Dense Kondo semiconductor $C e O s_{4} S b_{12}$

Abstract

References in corpus (4)

Cited by in corpus (2)

Elastic properties of the Non-Fermi liquid metal CeRu4​Sb12​ and the Dense Kondo semiconductor CeOs4​Sb12​

Abstract

References in corpus (4)

Cited by in corpus (2)

Elastic properties of the Non-Fermi liquid metal $C e R u_{4} S b_{12}$ and the Dense Kondo semiconductor $C e O s_{4} S b_{12}$