Berlin 2015 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 11: Magnetic Heuslers, Half-Metals and Oxides (jointly with MA)

TT 11.3: Vortrag

Montag, 16. März 2015, 10:00–10:15, H 0112

Spin-selective electron localization induced by disorder in Mn-Co-Al Heusler alloys — •Sunil Wilfred D’Souza, Siham Ouardi, Lukas Wollmann, Stanislav Chadov, and Claudia Felser — Max-Planck-Institut für Chemische Physik fester Stoffe

Understanding the role of disorder opens new alternatives in the state-of-the-art design of the multicomponent materials. First proposals to improve the electron transport characteristics by constructive chemical disorder were already suggested for the tetragonal non-halfmetallic ferrimagnetic Mn₃Ga-based Heusler alloys, where the possibility of the spin-selective electron localization was demonstrated by the first-principles. Here we consider the spin-selective electron localization within the cubic Mn_2−xCo_1+xAl (0≤ x≤1) Heusler series. In contrast to the strongly anisotropic tetragonal case, the isotropic cubic geometry allows for an easier experimental check of the proposed spin-selective electron localization. The residual transport properties, i.e. spin-projected resistivities were calculated within the Kubo-Greenwood linear response formalism, using Coherent Potential Approximation (CPA) description for the electron localization, within the framework of the fully-relativistic SPR-KKR Green’s function method. Here we also give the comparison with the first experimental data.