X-ray absorption and x-ray magnetic dichroism study on Ca3CoRhO6 and Ca3FeRhO6

T. Burnus; Z. Hu; Hua Wu; J. C. Cezar; S. Niitaka; H. Takagi; C. F. Chang; N. B. Brookes; H. -J. Lin; L. Y. Jang; A. Tanaka; K. S. Liang; C. T. Chen; L. H. Tjeng

doi:10.1103/PhysRevB.77.205111

X-ray absorption and x-ray magnetic dichroism study on Ca3CoRhO6 and Ca3FeRhO6

Strongly Correlated Electrons 2008-05-15 v1

Authors: T. Burnus , Z. Hu , Hua Wu , J. C. Cezar , S. Niitaka , H. Takagi , C. F. Chang , N. B. Brookes , H. -J. Lin , L. Y. Jang , A. Tanaka , K. S. Liang , C. T. Chen , L. H. Tjeng

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Abstract

Using x-ray absorption spectroscopy at the Rh-L_2,3, Co-L_2,3, and Fe-L_2,3 edges, we find a valence state of Co^2+/Rh^4+ in Ca3CoRhO6 and of Fe^3+/Rh^3+ in Ca3FeRhO6. X-ray magnetic circular dichroism spectroscopy at the Co-L_2,3 edge of Ca3CoRhO6 reveals a giant orbital moment of about 1.7mu_B, which can be attributed to the occupation of the minority-spin d_0d_2 orbital state of the high-spin Co^2+ (3d^7) ions in trigonal prismatic coordination. This active role of the spin-orbit coupling explains the strong magnetocrystalline anisotropy and Ising-like magnetism of Ca3CoRhO6.

Keywords

x-ray absorption spectroscopy x-ray magnetic circular dichroism valence state orbital moment spin-orbit coupling magnetocrystalline anisotropy

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@article{arxiv.0803.0293,
  title  = {X-ray absorption and x-ray magnetic dichroism study on Ca3CoRhO6 and Ca3FeRhO6},
  author = {T. Burnus and Z. Hu and Hua Wu and J. C. Cezar and S. Niitaka and H. Takagi and C. F. Chang and N. B. Brookes and H. -J. Lin and L. Y. Jang and A. Tanaka and K. S. Liang and C. T. Chen and L. H. Tjeng},
  journal= {arXiv preprint arXiv:0803.0293},
  year   = {2008}
}

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7 pages, 6 figures

X-ray absorption and x-ray magnetic dichroism study on Ca3CoRhO6 and Ca3FeRhO6

Abstract

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