Dresden 2011 – wissenschaftliches Programm
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KR: Fachgruppe Kristallographie
KR 5: Poster Multiferroics (Joint Session of MA, DF, DS, KR, TT)
KR 5.68: Poster
Dienstag, 15. März 2011, 10:45–13:00, P2
Electronic structure of the austenitic and martensitic phase of Ni2MnGa . — •Aleksej Laptev1, Philipp Leicht1, Mikhail Fonin1, Martin Weser2, Hendrik Vita2, Yuriy Dedkov2, S. W. D’Souza3, and Sudipta Roy Barman3 — 1Fachbereich Physik, Universität Konstanz, 78457 Konstanz — 2Fritz-Haber-Institut der Max-Planck-Gesellschaft, 14195 Berlin — 3UGC-DAE Consortium for Scientific Research, 452001 Indore, India
Recently Ni2MnGa and related alloys have attracted strong scientific interest due to a reported magnetic field induced strain of up to 10 % in the low temperature martensitic phase. The occurrence of the structural martensitic phase transition is reported to be closely related to the electronic structure of this material. Especially strong Fermi-surface nesting was proposed for this material [1,2]. Here we report the investigation of the electronic structure of a Ni2MnGa(001) single crystal with angle resolved photoemission (ARPES). The sample was also studied by means of STM and revealed a well-ordered and reconstruction-free surface. ARPES measurements were performed in both austenitic and martensitic state. The obtained Fermi-surface and band structures of both phases were compared with currently existing electronic structure calculations [1,2]. At this preliminary point of our analysis good agreement between theory and experiment is found.
This work was supported by the BMBF-Project MSM-Sens 13N10062.
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