X-ray magnetic circular dichroism measurements in Ni up to 200 GPa: resistant ferromagnetism |
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Authors: | Torchio R Kvashnin Y O Pascarelli S Mathon O Marini C Genovese L Bruno P Garbarino G Dewaele A Occelli F Loubeyre P |
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Affiliation: | European Synchrotron Radiation Facility, 6 Rue Jules Horowitz, BP220, 38043 Grenoble Cedex, France. |
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Abstract: | 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. |
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