Document 
Eur. Phys. J. B 30, 481-486 (2002)
DOI: 10.1140/epjb/e2002-00404-6
Temperature dependences of resistivity and magnetoresistivity for half-metallic ferromagnets
V.Yu. Irkhin1 and M.I. Katsnelson1, 21 Institute of Metal Physics, 620219 Ekaterinburg, Russia
2 Department of Physics, Uppsala University, Box 530, 751 21 Uppsala, Sweden
(Received 16 September 2002 / Received in final form 6 November 2002 Published online 31 December 2002 )
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
T9/2 for
T<T*
and to
T7/2 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.
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.
© EDP Sciences, Società Italiana di Fisica, Springer-Verlag 2002