Regensburg 2022 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 35: Poster 2
MA 35.39: Poster
Donnerstag, 8. September 2022, 16:00–18:00, P4
Electric transport properties of Ni-Mn-In alloy exposed to external stimuli — •Sergiy Konoplyuk1 and Alexandr Kolomiets2 — 1Institute of magnetism of NASU and MESU, Kyiv, Ukraine — 2Department of Physics, Lviv Polytechnic National University, Lviv, Ukraine
The polycrystalline Ni45.4Mn40In14.6 Heusler alloy was studied to find dominant factors affecting its electric transport behavior in austenitic and martensitic phases. Analysis of three main contributions into temperature dependent resistivity has shown that prevalent mechanisms of carrier scattering in the austenitic phase are scattering on structural and magnetic disorders rather than on thermal fluctuations.
In spite of the small transformation volume effect of 0.09 %, application of hydrostatic pressure of 2 GPa results in almost threefold rise in the longitudinal resistivity and twofold rise in the Hall resistivity due to the pressure-induced martensitic transformation. The measurements of the ordinary Hall resistivity have shown that main charge carriers in both phases are holes whose mobility is ten times as high in the austenitic phase as in the martensitic one.
The anomalous Hall resistivity (AHE) of the Ni45.4Mn40In14.6 reaches significant magnitude of 20 microOhm*cm in the martensitic phase. Unusual scaling relation between AHE and the longitudinal resistivity is discussed.