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MA: Fachverband Magnetismus

MA 51: Magnetic Shape Memory Alloys (Joint Session with MM)

MA 51.3: Vortrag

Freitag, 20. März 2015, 10:00–10:15, H 0112

Angular-resolved photoemission spectra of Heusler alloys: Ni₂MnGa as a case study — •Václav Drchal¹, Vitalyi Feyer², Claus Michael Schneider², Yaroslav Polyak¹, Josef Kudrnovský¹, Oleg Heczko¹, Jan Honolka¹, Vladimír Cháb¹, Jaromír Kopeček¹, and Ján Lančok¹ — ¹Institute of Physics, Acad. Sci. Czech Republic, Praha, Czech Republic — ²Peter-Grünberg-Institut, Forschungszentrum Jülich, 52425 Jülich, Germany

We have calculated the electronic structure and angular-resolved photoemission spectra of Heusler alloys from first principles using the TB-LMTO method. The disorder, caused either by non-stoichiometry, or by swapping of atoms between sublattices is treated within the CPA. Matrix elements are included within the dipole approximation. Theoretical results are compared with experimental data of a weakly off-stoichiometric Ni_49.7Mn_29.1Ga_21.2 alloy that were measured by a photoelectron microscope at the NanoESCA beamline of the Elettra synchrotron. We will discuss the dependence of spectra on the structure (austenitic/martensitic) and the role played by disorder.