TY  - JOUR
AU  - Hering, Paul
AU  - Friese, Karen
AU  - Voigt, Jörg
AU  - Persson, Jörg
AU  - Aliouane, Nadir
AU  - Grzechnik, Andrzej
AU  - Senyshyn, Anatoliy
AU  - Brückel, Thomas
TI  - Structure, Magnetism, and the Magnetocaloric Effect of MnFe$_{4}$Si$_{3}$ Single Crystals and Powder Samples
JO  - Chemistry of materials
VL  - 27
IS  - 20
SN  - 1520-5002
CY  - Washington, DC
PB  - American Chemical Society
M1  - FZJ-2015-06482
SP  - 7128 - 7136
PY  - 2015
AB  - 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 P6 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.
LB  - PUB:(DE-HGF)16
UR  - <Go to ISI:>//WOS:000363915000026
DO  - DOI:10.1021/acs.chemmater.5b03123
UR  - https://juser.fz-juelich.de/record/256615
ER  -