European Synchrotron Radiation Facility, 6 Rue Jules Horowitz, BP220, 38043 Grenoble Cedex, France.
Phys Rev Lett. 2011 Dec 2;107(23):237202. doi: 10.1103/PhysRevLett.107.237202. Epub 2011 Nov 30.
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.
面心立方结构的镍在非常大的压力范围内具有结构稳定性，这为实验研究简单压缩如何改变磁性提供了独特的机会。K 边 X 射线磁圆二色性（XMCD）表明，面心立方结构的镍在 200GPa 以下保持铁磁性，这与最近预测的在 160GPa 下铁磁相突然转变为顺磁相的结果相矛盾。密度泛函理论计算表明，K 边 XMCD 的压力演化与 p 投影轨道矩的演化密切相关，而不是与总自旋矩的演化相关。预计镍的磁性将在 400GPa 以上消失。
