Giant magneto-elastic coupling in a metallic helical metamagnet

Details Giant magneto-elastic coupling in a metallic helical metamagnet Giant magneto-elastic coupling in a metallic helical metamagnet

2010-03-05

arxiv.org/abs/1003.1206v3

Phys. Rev. Lett. 104, 247202 (2010)

Physics

Condensed Matter

Materials Science

5 pages, 4 figures (3 in colour)

Scientific paper

10.1103/PhysRevLett.104.247202

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 inter-atomic 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.

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