X-ray magnetic circular dichroism measurements in Ni up to 200 GPa: resistant ferromagnetism

The structural stability of fcc Ni over a very large pressure range offers a unique opportunity to experimentally investigate how magnetism is modified by simple compression. K-edge x-ray magnetic circular dichroism (XMCD) shows that fcc Ni is ferromagnetic up to 200 GPa, contradicting recent predic...

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Published inPhysical review letters Vol. 107; no. 23; p. 237202
Main Authors Torchio, R, Kvashnin, Y O, Pascarelli, S, Mathon, O, Marini, C, Genovese, L, Bruno, P, Garbarino, G, Dewaele, A, Occelli, F, Loubeyre, P
Format Journal Article
LanguageEnglish
Published United States 30.11.2011
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Summary:The structural stability of fcc Ni over a very large pressure range offers a unique opportunity to experimentally investigate how magnetism is modified by simple compression. K-edge x-ray magnetic circular dichroism (XMCD) shows that fcc Ni is ferromagnetic up to 200 GPa, contradicting recent predictions of an abrupt transition to a paramagnetic state at 160 GPa. Density functional theory calculations point out that the pressure evolution of the K-edge XMCD closely follows that of the p projected orbital moment rather than that of the total spin moment. The disappearance of magnetism in Ni is predicted to occur above 400 GPa.
ISSN:1079-7114
DOI:10.1103/physrevlett.107.237202