Non-Kondo mechanism for resistivity minimum in spin ice conduction systems

Details Non-Kondo mechanism for resistivity minimum in spin ice conduction systems Non-Kondo mechanism for resistivity minimum in spin ice conduction systems

2012-01-04

arxiv.org/abs/1201.0929v2

Phys. Rev. Lett. 108, 066406 (2012)

Physics

Condensed Matter

Strongly Correlated Electrons

5 pages, 3 figures, accepted for publication in Physical Review Letters

Scientific paper

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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