近金属尖晶石钴钒酸盐的电子态和轨道玻璃态的可能起源：X射线磁圆二色性研究
Electronic States and Possible Origin of the Orbital-Glass State in a Nearly Metallic Spinel Cobalt Vanadate: An X-ray Magnetic Circular Dichroism Study
摘要：
我们用X射线吸收光谱（XAS）、X射线磁性圆二色性（XMCD）和随后的组态相互作用团簇模型计算研究了轨道玻璃态（短程轨道有序）尖晶石钒酸盐Co $_{1.21}$ V $_{1.79}$ O $_{4}$的轨道状态。从的XMCD谱的符号，它被发现，自旋磁矩的Co离子是平行于所施加的磁场和V离子的反平行于它，与中子散射研究一致。结果表明，在八面体位置的过量的钴离子采取三价低自旋状态，并诱导一个随机电位的V亚晶格。V离子的轨道磁矩虽然有限，但很小，这表明有序轨道主要由实数轨道组成。
英文摘要：
We have investigated the orbital states of the orbital-glassy (short-range orbital ordered) spinel vanadate Co$_{1.21}$V$_{1.79}$O$_{4}$ using x-ray absorption spectroscopy (XAS), x-ray magnetic circular dichroism (XMCD), and subsequent configuration-interaction cluster-model calculation. From the sign of the XMCD spectra, it was found that the spin magnetic moment of the Co ion is aligned parallel to the applied magnetic field and that of the V ion anti-parallel to it, consistent with neutron scattering studies. It was revealed that the excess Co ions at the octahedral site take the trivalent low-spin state, and induce a random potential to the V sublattice. The orbital magnetic moment of the V ion is small although finite, suggesting that the ordered orbitals mainly consists of real-number orbitals.
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