Speakers: Josef Kudrnovský (Department of Condensed Matter Theory, Institute of physics, ASCR, Prague; department of condensed matter physics, MFF UK Prague)
Place: Na Slovance, main lecture hall
Presented in Czech
Organisers:
Department of Condensed Matter Theory
Abstract:
The spin-disorder resistivity (SDR) of transition metal ferromagnets, rare-earth metals, ordered transition metal ferromagnets, and Ni-based Heusler alloys is determined from first principles. We identify the SDR at the Curie temperature with the residual resistivity of the corresponding system evaluated in the framework of the disordered local moment (DLM) model which has the zero spin-spin correlation function. The Kubo-Greenwood approach is employed to estimate the resistivity.
The underlying electronic structure is determined in the framework of the tight-binding linear muffin-tin orbital method which employs the coherent potential approximation (CPA) to describe the DLM state. The DLM fixed-spin moment approach is used in the case when the DLM moment collapses and the open-core approach is adopted for rare-earth metals.
For bcc-Fe and Ni2MnSn Heusler alloy we also estimate the temperature dependence of the resistivity below the Curie temperature using semiempirical approach. Calculations are compared with an alternative supercell Kubo-Landauer approach developed recently. Overall good agreement with available experimental data is obtained.
In collaboration with V. Drchal, I.Turek, S. Khmelevskiy, J. Glasbrener, and K. Belashchenko,
Published: Phys.Rev. B85(2012) 214405 and Phys.Rev. B86 (2012) 214405
Copyright © 2008-2010, Fyzikální ústav AV ČR, v. v. i.
