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Structure, Magnetism, and the Magnetocaloric Effect of MnFe4Si3 Single Crystals and Powder Samples

Magnetic and structural properties of high quality magnetocaloric MnFe4Si3 single crystals are investigated macroscopically and on an atomic scale. Refinements of combined neutron and X-ray single crystal diffraction data introduce a new structural model in space group P 6 characterized by partial o...

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Published in:Chemistry of materials 2015-10, Vol.27 (20), p.7128-7136
Main Authors: Hering, Paul, Friese, Karen, Voigt, Jörg, Persson, Jörg, Aliouane, Nadir, Grzechnik, Andrzej, Senyshyn, Anatoliy, Brückel, Thomas
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container_end_page 7136
container_issue 20
container_start_page 7128
container_title Chemistry of materials
container_volume 27
creator Hering, Paul
Friese, Karen
Voigt, Jörg
Persson, Jörg
Aliouane, Nadir
Grzechnik, Andrzej
Senyshyn, Anatoliy
Brückel, Thomas
description Magnetic and structural properties of high quality magnetocaloric MnFe4Si3 single crystals are investigated macroscopically and on an atomic scale. Refinements of combined neutron and X-ray single crystal diffraction data introduce a new structural model in space group P 6 characterized by partial ordering of Mn and Fe into layers perpendicular to c on one of the transition metal sites. A second transition metal site is exclusively occupied by iron. MnFe4Si3 has a phase transition to a ferromagnetically ordered phase at approximately 300 K and displays a strong anisotropy of the magnetization and the magnetocaloric effect with the easy axis of magnetization in the a,b-plane. This is confirmed by a refinement of the magnetic structure in the magnetic spacegroup Pm′, which shows that the spins on the sites with mixed occupancy of Mn and Fe are aligned in the a,b-plane. A significant magnetic moment for the site exclusively occupied by iron could not be refined. The thermal evolution of the lattice parameters exhibits an anisotropic behavior and clearly reflects the onset of magnetic ordering. A comparison of the ordered moment and the effective paramagnetic moment hints toward itinerant magnetism in the system.
doi_str_mv 10.1021/acs.chemmater.5b03123
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title Structure, Magnetism, and the Magnetocaloric Effect of MnFe4Si3 Single Crystals and Powder Samples
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