Angle-resolved photoemission spectra of Heusler alloys: Ni2MnGa as a case study

Přednášející
  • Václav Drchal
Místo
Na Slovance, přednáškový sál v přízemí
Jazyk události
Angličtina
Afiliace
Oddělení teorie kondenzovaných látek, FzU AVCR
Datum
16. 6. 2015, 15.00
Abstract: We have calculated the electronic structure and angle-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 Ni49.7Mn29.1Ga21.2 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 (austenite vs. martensite) and the role played by disorder.