Non-Kondo mechanism for resistivity minimum in spin ice conduction systems |
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Authors: | Udagawa Masafumi Ishizuka Hiroaki Motome Yukitoshi |
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Institution: | Department of Applied Physics, University of Tokyo, Tokyo, Japan. |
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Abstract: | We present a mechanism of resistivity minimum in conduction electron systems coupled with localized moments, which is distinguished from the Kondo effect. Instead of the spin-flip process in the Kondo effect, electrons are elastically scattered by local spin correlations which evolve in a particular way under geometrical frustration as decreasing temperature. This is demonstrated by the cellular dynamical mean-field theory for a spin-ice-type Kondo lattice model on a pyrochlore lattice. Peculiar temperature dependences of the resistivity, specific heat, and magnetic susceptibility in the non-Kondo mechanism are compared with the experimental data in metallic Ir pyrochlore oxides. |
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