The irreversible structural change in Mn1.1Fe0.9P0.8Ge0.2: Evidence for a magnetic driver

Xubo Liu; D. H. Ryan; L. M. D. Cranswick; D. M. Liu; H. G. Zhang; Ming Yue; Z. Altounian

doi:10.1063/1.4973287

AIP Advances (May 2017)

The irreversible structural change in Mn1.1Fe0.9P0.8Ge0.2: Evidence for a magnetic driver

Xubo Liu,
D. H. Ryan,
L. M. D. Cranswick,
D. M. Liu,
H. G. Zhang,
Ming Yue,
Z. Altounian

Affiliations

Xubo Liu: Physics Department and Centre for the Physics of Materials, McGill University,3600 University Street, Montreal, Quebec H3A 2T8, Canada
D. H. Ryan: Physics Department and Centre for the Physics of Materials, McGill University,3600 University Street, Montreal, Quebec H3A 2T8, Canada
L. M. D. Cranswick: Canadian Neutron Beam Centre, National Research Council Canada, Chalk River Laboratories, Chalk River, Ontario K0J 1J0, Canada
D. M. Liu: College of Materials Science and Engineering, Beijing University of Technology, Beijing 100122, China
H. G. Zhang: College of Materials Science and Engineering, Beijing University of Technology, Beijing 100122, China
Ming Yue: College of Materials Science and Engineering, Beijing University of Technology, Beijing 100122, China
Z. Altounian: Physics Department and Centre for the Physics of Materials, McGill University,3600 University Street, Montreal, Quebec H3A 2T8, Canada

DOI: https://doi.org/10.1063/1.4973287
Journal volume & issue: Vol. 7, no. 5
pp. 056407 – 056407-6

Abstract

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Neutron powder diffraction measurements complemented by first-principles density functional theory (DFT) calculations have been used to study the irreversible change that accompanies the reversible magnetocaloric transition (MCT) in Mn1.1Fe0.9P0.8Ge0.2. We observe the growth and loss of long-period antiferromagnetism as we pass through the MCT for the first time and the development of significant strain in the cycled material. We attribute both the reversible and irreversible changes to the distance dependence of the Mn-Mn exchange in the Mn-P(Ge) ab–plane layers.

Published in AIP Advances

ISSN: 2158-3226 (Online)
Publisher: AIP Publishing LLC
Country of publisher: United States
LCC subjects: Science: Physics
Website: http://aipadvances.aip.org/

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