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Open AccessArticle

Magnetic Transitions in the Co-Modified Mn2Sb System

1
Institute of Crystallography, RWTH Aachen University, 52066 Aachen, Germany
2
Helmholtz-Zentrum Berlin, Hahn-Meitner Platz 1, 14109 Berlin, Germany
3
Jülich Centre for Neutron Science—2/Peter Grünberg Institute—4, Forschungszentrum Jülich, 52425 Jülich, Germany
*
Author to whom correspondence should be addressed.
Inorganics 2018, 6(4), 113; https://doi.org/10.3390/inorganics6040113
Received: 10 September 2018 / Revised: 8 October 2018 / Accepted: 17 October 2018 / Published: 19 October 2018
(This article belongs to the Section Inorganic Solid-State Chemistry)
Mn2Sb is ferrimagnetic below its Curie temperature (TC) and passes through a spin flip transition with decreasing temperature. The Co substitution induces an additional first-order phase transition from the ferrimagnetic (FRI) to an antiferromagnetic (AFM) state. This phase transition is connected to a sizable magnetocaloric effect (MCE). To understand the underlying mechanisms, the temperature dependence of structural and magnetic changes was analyzed. At the same time, the influence of the Co substitution was explored. Three Mn2−xCoxSb (x = 0.1, 0.15, 0.2) compounds were synthesized by cold crucible induction melting. Neutron powder diffraction was performed to determine the magnetic structures and to obtain the individual magnetic moments on both symmetrically independent Mn sites. In combination with the temperature-dependent magnetization measurements, the magnetic phase transition temperatures were identified. In the low-temperature range, additional antiferromagnetic peaks were detected, which could be indexed with a propagation vector of (0 0 ½). In Mn1.9Co0.1Sb at 50 K and in Mn1.8Co0.2Sb at 200 K, a co-existence of the FRI and the AFM state was observed. The pure AFM state only occurs in Mn1.8Co0.2Sb at 50 K. View Full-Text
Keywords: co-modified Mn2Sb; magnetocaloric effect; neutron powder diffraction; magnetic structures; ferrimagnetic compounds; antiferromagnetic compounds co-modified Mn2Sb; magnetocaloric effect; neutron powder diffraction; magnetic structures; ferrimagnetic compounds; antiferromagnetic compounds
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MDPI and ACS Style

Wilden, J.S.; Hoser, A.; Chikovani, M.; Perßon, J.; Voigt, J.; Friese, K.; Grzechnik, A. Magnetic Transitions in the Co-Modified Mn2Sb System. Inorganics 2018, 6, 113.

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