Temperature dependences of resistivity and magnetoresistivity for half-metallic ferromagnets

Details Temperature dependences of resistivity and magnetoresistivity for half-metallic ferromagnets Temperature dependences of resistivity and magnetoresistivity for half-metallic ferromagnets

2002-04-12

arxiv.org/abs/cond-mat/0204265v1

Eur. Phys. J. B30, 481 (2002)

Physics

Condensed Matter

Strongly Correlated Electrons

6 pages, RevTeX, 2 figures

Scientific paper

10.1140/epjb/e2002-00404-6

Peculiarities of transport properties of three- and two-dimensional half-metallic ferromagnets are investigated, which are connected with the absence of spin-flip scattering processes. The temperature and magnetic field dependences of resistivity in various regimes are calculated. The resistivity is proportional to T^{9/2} for TT*, T* being the crossover temperature for longitudinal scattering processes. The latter scale plays also an important role in magnetoresistance. The contribution of non-quasiparticle (incoherent) states to the transport properties is discussed. It is shown that they can dominate in the temperature dependence of the impurity-induced resistivity and in the tunnel junction conductivity.

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