Kondo Behavior of U in CaB$_6$

Details Kondo Behavior of U in CaB$_6$ Kondo Behavior of U in CaB$_6$

2004-07-07

arxiv.org/abs/cond-mat/0407158v1

Physics

Condensed Matter

Materials Science

4 pages, 4 figures, submitted for publication to Europhysics Letters

Scientific paper

10.1016/j.physb.2005.01.269

Replacing U for Ca in semiconducting CaB$_6$ at the few at.% level induces metallic behaviour and Kondo-type phenomena at low temperatures, a rather unusual feature for U impurities in metallic hosts. For Ca$_{0.992}$U$_{0.008}$B$_6$, the resistance minimum occurs at $T$ = 17 K. The subsequent characteristic logarithmic increase of the resistivity with decreasing temperature merges into the expected $T^2$ dependence below 0.8 K. Data of the low-temperature specific heat and the magnetization are analyzed by employing a simple resonance-level model. Analogous measurements on LaB$_6$ with a small amount of U revealed no traces of Kondo behavior, above 0.4 K.

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