Journal Article

FZJ-2015-06482

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Structure, Magnetism, and the Magnetocaloric Effect of MnFe$_{4}$Si$_{3}$ Single Crystals and Powder Samples

Hering, P.FZJ* ; Friese, K. (Corresponding author)FZJ* ; Voigt, J.FZJ* ; Persson, J.FZJ* ; Aliouane, N. ; Grzechnik, A. ; Senyshyn, A. ; Brückel, T.FZJ*

2015
American Chemical Society Washington, DC

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Please use a persistent id in citations: doi:10.1021/acs.chemmater.5b03123

Abstract: 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.

Keyword(s): Chemical Reactions and Advanced Materials (1st) ; Key Technologies (1st) ; Magnetism (2nd)

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Contributing Institute(s):

1. Streumethoden (JCNS-2)
2. Streumethoden (PGI-4)
3. JARA-FIT (JARA-FIT)
4. JCNS-FRM-II (JCNS (München) ; Jülich Centre for Neutron Science JCNS (München) ; JCNS-FRM-II)

Research Program(s):

1. 144 - Controlling Collective States (POF3-144) (POF3-144)
2. 524 - Controlling Collective States (POF3-524) (POF3-524)
3. 6212 - Quantum Condensed Matter: Magnetism, Superconductivity (POF3-621) (POF3-621)
4. 6213 - Materials and Processes for Energy and Transport Technologies (POF3-621) (POF3-621)
5. 6G4 - Jülich Centre for Neutron Research (JCNS) (POF3-623) (POF3-623)

Experiment(s):

1. SPODI: High resolution powder diffractometer (SR8a)

Appears in the scientific report 2015

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Database coverage:
; Current Contents - Engineering, Computing and Technology ; Current Contents - Physical, Chemical and Earth Sciences ; IF >= 5 ; JCR ; Nationallizenz ; SCOPUS ; Science Citation Index ; Science Citation Index Expanded ; Thomson Reuters Master Journal List ; Web of Science Core Collection

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