Abstract
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.
Highlights
Mn2 Sb crystalizes in a tetragonal Cu2 Sb-type structure [1,2,3,4,5,6,7,8,9]
The nuclear structure is stable over a broad temperature range, while the magnetic structure passes through a series of phase transitions
The first magnetic phase transition for Mn2 Sb occurs at TC ~550 K [1,2,3,4,5,6,7,8,9,10,11]
Summary
Mn2 Sb (space group: P4/nmm) crystalizes in a tetragonal Cu2 Sb-type structure [1,2,3,4,5,6,7,8,9]. The Mn atoms are located on two symmetrically independent crystallographic sites: Mn1 The first magnetic phase transition for Mn2 Sb occurs at TC ~550 K [1,2,3,4,5,6,7,8,9,10,11]. This temperature, the material is ferrimagnetic with the magnetic moments aligned parallel to the c axis [2,6,9,10].
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