Heavy-fermion behavior, crystalline electric field effects, and weak ferromagnetism in SmOs4Sb12
- Author(s)
- William M. Yuhasz, Neil A. Frederick, Pei Chun Ho, N P Butch, B J Taylor, T A Sayles, M. Brian Maple, Jonathan B. Betts, A H Lacerda, Peter Franz Rogl, Gerald Giester
- Abstract
The filled skutterudite compound SmOs4Sb12 was prepared in single-crystal form and characterized using x-ray diffraction, specific-heat, electrical resistivity, and magnetization measurements. The SmOs4Sb12 crystals have the LaFe4P 12-type structure with lattice parameter a=9.3085 A°. Specific-heat measurements indicate a large electronic specific-heat coefficient of ˜880 mJ/mol K2, from which an enhanced effective mass m* ˜170me is estimated. The specific-heat data also suggest crystalline electric field (CEF) splitting of the Sm3+J=5/2 multiplet into a G7 doublet ground state and a G8 quartet excited state separated by ~37 K. Electrical resistivity ?(T) measurements reveal a decrease in ?(T) below ~50 K that is consistent with CEF splitting of ~33 K between a G7 doublet ground state and G8 quartet excited state. Specific-heat and magnetic susceptibility measurements display a possible weak ferromagnetic transition at ~2.6 K, which could be an intrinsic property of SmOs4Sb 12 or possibly due to an unknown impurity phase. Œ2005 The American Physical Society.
- Organisation(s)
- Department of Physical Chemistry, Department of Mineralogy and Crystallography
- External organisation(s)
- University of California, San Diego, National High Magnetic Field Laboratory
- Journal
- Physical Review B
- Volume
- 71
- Pages
- 1-9
- No. of pages
- 9
- ISSN
- 1098-0121
- Publication date
- 2005
- Peer reviewed
- Yes
- Austrian Fields of Science 2012
- 105113 Crystallography
- Portal url
- https://ucrisportal.univie.ac.at/en/publications/e5374eaa-b6c8-4e6d-89eb-4d3eef840c3c