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Issue 30, 2012
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Study of the antiferromagnetism of Mn5Si3: an inverse magnetocaloric effect material

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Abstract

The intermetallic compound Mn5Si3 has been studied by high-resolution Time-of-Flight (TOF) neutron powder diffraction. At room temperature, Mn5Si3 is paramagnetic and it crystallizes in the P63/mcm hexagonal space group. Magnetic susceptibility and specific heat measurements show clearly two major anomalies. At 100(1) K, a transition (Tm1) corresponds to a collinear antiferromagnetic ordering (AF1). The second transition at 62(1) K (Tm2), which was still unclear, highlights a magneto-structural distortion from an orthorhombic symmetry (AF1) to a monoclinic symmetry (AF2), which could be influenced by a low magnetic field. Such a magneto-structural change is directly associated with the inverse magnetocaloric effect behaviour of this material. A new description by means of the commensurate magnetic superspace groups, Ccmm1′(0β0)00ss and C21/m1′(αβ0)0ss, has been used to refine properly the low temperature antiferromagnetic structures. Band structure calculations using the self-consistent, spin-polarized TB-LMTO method were accomplished to support the magnetic properties observed at low temperature.

Graphical abstract: Study of the antiferromagnetism of Mn5Si3: an inverse magnetocaloric effect material

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Publication details

The article was received on 08 Jan 2012, accepted on 23 May 2012 and first published on 27 Jun 2012


Article type: Paper
DOI: 10.1039/C2JM00154C
Citation: J. Mater. Chem., 2012,22, 15275-15284
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    Study of the antiferromagnetism of Mn5Si3: an inverse magnetocaloric effect material

    M. Gottschilch, O. Gourdon, J. Persson, C. de la Cruz, V. Petricek and T. Brueckel, J. Mater. Chem., 2012, 22, 15275
    DOI: 10.1039/C2JM00154C

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