Low-temperature anomalies in magnetic, transport, and thermal properties of single-crystal CeRhSn with valence fluctuations

Kim Moo-Sung

Echizen Yuji

Umeo Kazunori

Kobayashi Sinichiro

Sera Masafumi

Salamakha P. S.

Sologub O. L.

Takabatake Toshiro

Chen X.

Tayama Takashi

Sakakibara Toshiro

Jung M. H.

Maple M. B.

Physical Review B - Condensed Matter and Materials Physics

Magnetic, transport, thermal, and crystallographic properties are reported for single crystals of CeRhSn crystallizing in the hexagonal ZrNiAl-type structure. We found high anisotropy in both electrical resistivity (ρ a≈5ρc at 70 K) and magnetic susceptibility (X c≈10Xa at 0.4 K), which is atypical for a valence-fluctuating Ce compound. At low temperatures, ρ(T) and X(T) show power-law behaviors; ρa(T)∝(T)1.5 and ρc(T)∝T, and Xa∝T -0.35 and Xc∝T-1.1 down to 0.4 K. These behaviors and the rather large residual resistivity were not affected by long-term annealing. On cooling from 7 K to 0.5 K, the specific heat divided by temperature C/T increased as -ln T and saturated to a rather large value of 0.2 J/mol K2. These experimental results are discussed in relation to the possible atomic disorder.

eng

American Physical Society

Copyright (c) 2003 The American Physical Society.

[ISSN] 1098-0121

[DOI] 10.1103/PhysRevB.68.054416

[NCID] AA11187113

[DOI] http://dx.doi.org/10.1103/PhysRevB.66.155202