Basic Properties of Magnetic Shape-Memory Materials from First-Principles Calculations |
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Authors: | Peter Entel Antje Dannenberg Mario Siewert Heike C. Herper Markus E. Gruner Denis Comtesse Hans-Joachim Elmers Michael Kallmayer |
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Affiliation: | 1. Faculty of Physics, University Duisburg-Essen, 47048, Duisburg, Germany 2. Institute of Physics, Johannes- Gutenberg University, 55128, Mainz, Germany
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Abstract: | The mutual influence of phase transformations, magnetism, and electronic properties of magnetic-shape memory Heusler materials is a basic issue of electronic structure calculations based on density functional theory. In this article, we show that these calculations can be pursued to finite temperatures, which allows to derive on a first-principles basis the temperature versus composition phase diagram of the pseudo-binary Ni-Mn-(Ga, In, Sn, Sb) system. The free energy calculations show that the phonon contribution stabilizes the body-centered-cubic (bcc)-like austenite structure at elevated temperatures, whereas magnetism favors the low-temperature martensite phase with body-centered-tetragonal (bct) or rather face-centered-tetragonal (fct) structure. The calculations also allow to make predictions of magnetostructural and magnetic field induced properties of other (new) magnetic Heusler alloys not based on NiMn such as Co-Ni-(Ga-Zn) and Fe-Co-Ni-(Ga-Zn) intermetallic compounds. |
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