Regensburg 2019 – wissenschaftliches Programm

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MM: Fachverband Metall- und Materialphysik

MM 25: Transport (Diffusion, conductivity, heat)

MM 25.9: Vortrag

Mittwoch, 3. April 2019, 12:30–12:45, H46

Low-temperature heat capacity of Fe-Mn alloys — •Marius Gerlitz, Martin Peterlechner, Sergiy Divinski, and Gerhard Wilde — Institute of Materials Physics, University of Münster, Germany

For a fundamental description of ferromagnetic materials, knowledge of characteristic thermodynamic properties is essential. The analysis of the magnetocaloric effect or magnetostriction is a significant step, feasible by specific heat measurements. The influence of magnetism, chemical composition and short-range order on the specific heat capacity of a series of Fe-Mn alloys (up to 9.5 at.% Mn) is systematically measured in the temperature interval between 1.9 K and 400 K. A physical properties measurement system (PPMS) is used and the 2-tau method is applied for the analysis. Additionally, a constant magnetic field of 3 T is applied to determine the impact of an external field. Furthermore, calorimetric measurements by differential scanning calorimetry (DSC) are performed using heating rates of 20 K/min in the temperature interval from 300 K to 723 K. Thermal - and magnetic entropy contributions are determined. The Debye temperatures and the electronic contribution to the specific heat are estimated. The results are discussed with respect to the chemical composition and probable short-range ordering.