Temperature dependences of resistivity and magnetoresistivity for half-metallic ferromagnets |
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Authors: | V.Yu. Irkhin M.I. Katsnelson |
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Affiliation: | (1) Institute of Metal Physics, 620219 Ekaterinburg, Russia, RU;(2) Department of Physics, Uppsala University, Box 530, 751 21 Uppsala, Sweden, SE |
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Abstract: | 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 T < T * and to T 7/2 for T > T *, 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. Received 16 September 2002 / Received in final form 6 November 2002 Published online 31 December 2002 |
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Keywords: | PACS. 72.10.Di Scattering by phonons, magnons, and other nonlocalized excitations – 72.25.Ba Spin polarized transport in metals – 75.50.Cc Other ferromagnetic metals and alloys |
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