Regensburg 2013 – scientific programme

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MA: Fachverband Magnetismus

MA 48: Spin-dependent Transport Phenomena

MA 48.9: Talk

Friday, March 15, 2013, 11:45–12:00, H23

Spin-disorder resistivity of ferromagnetic metals — •Josef Kudrnovsky¹, Vaclav Drchal¹, Ilja Turek², Sergei Khmelevskii³, James Glasbrenner⁴ und Kirill Belashchenko⁴ — ¹Institute of Physics AS CR, Prague — ²Charles University, Prague — ³University of Technology, Venna — ⁴University of Nebraska, Lincoln

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 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. The Kubo-Greenwood approach is employed to estimate the resistivity. For bcc-Fe we shall also estimate the temperature-dependent of resistivity below the Curie temperature using semiempirical approach. Calculations are compared with an alternative supercell Kubo-Landauer approach developed recently as well as with available experimental data and overall good agreement is obtained.