SKM 2023 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 3: Magnetic Materials for Efficient Energy Conversion
MA 3.8: Vortrag
Montag, 27. März 2023, 11:30–11:45, HSZ 401
Impact of disorder on the vibrational and magnetic properties of Ni-Mn-(Sn,In) Heusler alloys — •Olga N. Miroshkina1, Benedikt Eggert1, Johanna Lill1, Benedikt Beckmann2, David Koch2, Katharina Ollefs1, Francesco Cugini3, Massimo Solzi3, Mojmir Šob4, Martin Friák4, Oliver Gutfleisch2, Heiko Wende1, and Markus E. Gruner1 — 1University of Duisburg-Essen, Duisburg, Germany — 2Technical University of Darmstadt, Darmstadt, Germany — 3University of Parma, Parma, Italy — 4Czech Academy of Sciences, Brno, Czech Republic
Ni-Mn-Z with Z=In,Sn Heuslers are promising magnetocaloric systems to be employed in the magnetic cooling devices. In this respect, it is important to understand the influence of the main group element on the vibrational and magnetic properties of these materials. By combining large-scale density functional theory calculations with 119Sn-NRIXS and Mössbauer spectroscopy, we disentangled the vibrational contributions of the Sn atoms in Ni2MnSn. We found the evidence that inversion of optical modes at Γ involving the displacement of Ni and the heavier Z atoms predicted previously for other Ni-Mn-based Heuslers is also a property of Ni2MnSn, while deviation between experimental spectra and simulations might be explained by site-disorder [1]. In turn, the variation of Z in combination with chemical disorder can be employed to control the magnetization of the transition metal sublattice [2]. This work is funded by DFG within CRC/TRR 270.
[1] O.N. Miroshkina, B. Eggert et al., PRB (accepted) (2022).
[2] F. Cugini et al., PRB 105, 174434 (2022).