A. Barcza, Z. Gercsi, H. Michor, K. Suzuki, W. Kockelmann, K. S. Knight, K. G. Sandeman
We use neutron diffraction, magnetometry and low temperature heat capacity to probe giant magneto-elastic coupling in CoMnSi-based antiferromagnets and to establish the origin of the entropy change that occurs at the metamagnetic transition in such compounds. We find a large difference between the electronic density of states of the antiferromagnetic and high magnetisation states, and that the magnetic field-induced entropy change is composed of this contribution and a significant counteracting lattice component, deduced from the presence of negative magnetostriction.
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http://arxiv.org/abs/1208.3176
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