Measurement of a Pauli and Orbital Paramagnetic State in Bulk Gold Using X-Ray Magnetic Circular Dichroism Spectroscopy
Measurement of a Pauli and Orbital Paramagnetic State in Bulk Gold Using X-Ray Magnetic Circular Dichroism Spectroscopy
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DOI：
10.1103/physrevlett.108.047201
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发表时间：
2012-01-24
影响因子：
8.6
通讯作者：
Hori, Hidenobu
中科院分区：
文献类型：
--
作者：
Suzuki, Motohiro;Kawamura, Naomi;Hori, Hidenobu
我们通过 X 射线磁圆二色光谱在 Au L-2 和 L-3 边缘表明，块状金 (Au) 在外部磁场中表现出与温度无关的顺磁性。利用求和法则分析，我们得到了在10 T的外部磁场中1.3 x 10(-4) mu B/原子的磁矩和5d轨道的顺磁化率8.9 x 10(-6)。 Au 块体中诱导顺磁性的特点是轨道贡献较大（约 30%）。即使当金原子形成纳米粒子时，该轨道分量仍被保留，在稳定金纳米粒子中的自发自旋极化方面发挥着重要作用。
We show that bulk gold (Au) exhibits temperature-independent paramagnetism in an external magnetic field by x-ray magnetic circular dichroism spectroscopy at the Au L-2 and L-3 edges. Using the sum-rule analysis, we obtained a magnetic moment of 1.3 x 10(-4) mu B/atom in an external magnetic field of 10 T and a paramagnetic susceptibility of 8.9 x 10(-6) for the 5d orbit. The induced paramagnetism in bulk Au is characterized by a large (approximate to 30%) orbital contribution. This orbital component was retained even when Au atoms formed nanoparticles, playing an important role in stabilizing the spontaneous spin polarization in the Au nanoparticles.