title: Giant magnetoelastic coupling in a metallic helical metamagnet.
abstract: 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.
authors.affiliation: Department of Materials Science and Metallurgy, University of Cambridge, New Museums Site, Pembroke Street, Cambridge, CB2 3QZ, United Kingdom.
authors.forename: A
authors.initials: A
authors.lastname: Barcza
authors.forename: Z
authors.initials: Z
authors.lastname: Gercsi
authors.forename: K S
authors.initials: KS
authors.lastname: Knight
authors.forename: K G
authors.initials: KG
authors.lastname: Sandeman