Instituto de Física, Universidade Federal do Rio de Janeiro, 21941-972 Rio de Janeiro, Brazil.
Phys Rev Lett. 2012 Nov 9;109(19):197204. doi: 10.1103/PhysRevLett.109.197204.
The magnetic moment induced on Rh atoms, forming 1.6 nm average diameter clusters, embedded in an Al(2)O(3) matrix, has been determined using x-ray magnetic circular dichroism measurements. The magnetic moment varies linearly with the applied magnetic field. At 2.3 K and under 17 T, the spin magnetic moment amounts to 0.067(2) μ(B)/Rh atom. The orbital moment does not exceed 2% of the spin moment. The susceptibility is highly temperature dependent. This is in agreement with a prediction due to Moriya and Kawabata, that in itinerant electron systems, close to the onset of magnetism, the renormalization of the magnetic susceptibility by electron correlations, leads to a Curie-like behavior.
采用 X 射线磁圆二色性测量方法，确定了嵌入 Al(2)O(3) 基质中的 Rh 原子形成的平均直径为 1.6nm 的团簇所产生的磁矩。磁矩随外加磁场呈线性变化。在 2.3K 和 17T 下，自旋磁矩为 0.067(2)μ(B)/Rh 原子。轨道磁矩不超过自旋磁矩的 2%。磁化率对温度高度依赖。这与 Moriya 和 Kawabata 的预测一致，即在巡游电子体系中，接近磁有序的开始，电子相关导致磁化率的重整化，导致类似于居里的行为。
