Giant magnetoelastic coupling in a metallic helical metamagnet

Using high resolution neutron diffraction and capacitance dilatometry we show that the thermal evolution of the helimagnetic state in CoMnSi is accompanied by a change in interatomic distances of up to 2%, the largest ever found in a metallic magnet. Our results and the picture of competing exchange...

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Bibliographic Details
Published inPhysical review letters Vol. 104; no. 24; p. 247202
Main Authors Barcza, A, Gercsi, Z, Knight, K S, Sandeman, K G
Format Journal Article
LanguageEnglish
Published United States 18.06.2010
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Summary:Using high resolution neutron diffraction and capacitance dilatometry we show that the thermal evolution of the helimagnetic state in CoMnSi is accompanied by a change in interatomic distances of up to 2%, the largest ever found in a metallic magnet. Our results and the picture of competing exchange and strongly anisotropic thermal expansion that we use to understand them sheds light on a new mechanism for large magnetoelastic effects that does not require large spin-orbit coupling.
ISSN:1079-7114
DOI:10.1103/PhysRevLett.104.247202