Issue 30, 2012
From the journal:

Journal of Materials Chemistry

Study of the antiferromagnetism of Mn5Si3: an inverse magnetocaloric effect material†

Michael Gottschilch,a   Olivier Gourdon,*bc   Joerg Persson,d   Clarina de la Cruz,e   Vaclav Petricekf  and  Thomas Brueckeld  

* Corresponding authors

a Jülich Center for Neutron Science JCNS-2 and Peter Grünberg Institut PGI-4, JARA-FIT, Forschungszentrum Jülich, 52425 Jülich, Germany
E-mail: m.gottschlich@fz-juelich.de

b Jülich Centre for Neutron Science outstation at Spallation Neutron Source, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
E-mail: gourdonoa@ornl.gov
Fax: +1 865 241 5991
Tel: +1 865 576 6629

c Chemical and Engineering Division, Spallation Neutron Source, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
E-mail: gourdonoa@ornl.gov
Fax: +1 865 241 5991
Tel: +1 865 576 6629

d Jülich Centre for Neutron Science JCNS and Peter Grünberg Institute PGI; JCNS-2, PGI-4: Scattering Methods Forschungszentrum Jülich GmbH52425, Jülich, Germany
E-mail: t.brueckel@fz-juelich.de

e Quantum Condensed Matter Division, Spallation Neutron Source, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
E-mail: delacruzcr@ornl.gov

f Institute of Physics ASCR v.v.i., Na Slovance 2, 182 21 Praha, Czech Republic
E-mail: petricek@fzu.cz

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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Article information

DOI
https://doi.org/10.1039/C2JM00154C
Article type
Paper
Submitted
08 Jan 2012
Accepted
23 May 2012
First published
27 Jun 2012

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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