Regensburg 2019 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 9: Cooperative phenomena: Spin structures and magnetic phase transitions
MA 9.2: Vortrag
Montag, 1. April 2019, 15:15–15:30, H53
Structural and magnetic properties of the compounds of the series Mn5−xFexSi3 (x=1,2,3) — •Mohammed Ait haddouch, Jörg Voigt, Nicolo Violini, Karen Friese, Jörg Perßon, and Thomas Brückel — Jülich Centre for Neutron Science-2/Peter Grünberg Institut-4, Forschungszentrum Jülich GmbH, 52425 Jülich, Germany
The magnetic and the structural properties of the members of the Mn5−xFexSi3 series with x=1,2,3 are investigated macroscopically and with diffraction methods to reexamine their structural and magnetic phase diagram using single crystalline specimen. Similar to the parent compound Mn5Si3, the compounds with x=1, 2, exhibit two antiferromagnetic phase transitions AF1 and AF2. In Mn5Si3 an inverse magneto-caloric effect is related to the transition from AF1→ AF2. The inverse magnetocaloric effect has been assigned to a transition from a spin wave excitation spectrum to a fluctuation dominated excitation spectrum when the magnetic structure is changed by application of an external magnetic field [1]. We are now interested in the changes of the magnetic structure if Mn is replaced by Fe. We present the similarities and differences when compared to the undoped parent compound and try to explain the transition from the AF structure found for low Fe content to an FM structure found at large Fe(x > 3) content.
[1] N. Biniskos et al, PHYS REV LET 120,257205 (2018)