J. Phys. Soc. Jpn. 77 (2008) Supplement A pp. 148-152  |Previous Article| |Next Article|  |Table of Contents|
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Proc. Int. Conf. New Quantum Phenomena in Skutterudite and Related Systems (Skutterudite 2007)

Resistivity and Magnetoresistance of La-doped CeOs₄Sb₁₂ and PrOs₄Sb₁₂

B. Andraka¹, C. R. Rotundu¹, K. Ingersent¹, and P. Schlottmann²

The resistivity and magnetoresistance of La-doped CeOs₄Sb₁₂ and PrOs₄Sb₁₂ were investigated at temperatures down to 20 mK and in magnetic fields up to 18 T. The resistivity of Ce_0.98La_0.02Os₄Sb₁₂, in fields smaller than 4 T, has a Kondo-hole impurity temperature variation, i.e., ρ=ρ₀+AT², with a negative and strongly field-dependent A. However, the positive magnetoresistance suggests that this anomalous behavior is due to Kondo-hole bands. The magnetoresistance of La-doped PrOs₄Sb₁₂ confirms the singlet CEF ground state of Pr. Furthermore, its field variation and near isotropy argue against lowest-level crossing along any crystallographic direction. Instead, the results suggest avoided level crossing for all directions of the magnetic field. The possible origin of a dome-like shape in the magnetoresistance of the pure Pr compound is discussed.

KEYWORDS: skutterudites, heavy fermions, superconductivity
URL: http://jpsj.ipap.jp/link?JPSJS/77SA/148/

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