Valence, spin, and orbital state of Co ions in one-dimensional Ca3Co2O6:: An x-ray absorption and magnetic circular dichroism study

被引：104

作者：

Burnus, T.

Hu, Z.

Haverkort, M. W.

Cezar, J. C.

Flahaut, D.

Hardy, V.

Maignan, A.

Brookes, N. B.

Tanaka, A.

Hsieh, H. H.

Lin, H. -J.

Chen, C. T.

Tjeng, L. H.

机构：

[1] Univ Cologne, Inst Phys 2, D-50937 Cologne, Germany

[2] European Synchrotron Radiat Facil, F-38043 Grenoble, France

[3] Univ Caen, CNRS, ENSICAEN, Lab CRISMAT,UMR 6508, F-14050 Caen, France

[4] Univ Caen, CNRS, UMR 6508, Lab CRISMAT,Inst Sci Mat & Rayonnement, F-14050 Caen, France

[5] Hiroshima Univ, Dept Quantum Matter, ADSM, Higashihiroshima 7398530, Japan

[6] Natl Def Univ, Chung Cheng Inst Technol, Tao Yuan 335, Taiwan

[7] Natl Synchrotron Radiat Res Ctr, Hsinchu 30077, Taiwan

来源：

PHYSICAL REVIEW B | 2006年 / 74卷 / 24期

关键词：

D O I：

10.1103/PhysRevB.74.245111

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We have investigated the valence, spin, and orbital state of the Co ions in the one-dimensional cobaltate Ca3Co2O6 using x-ray absorption and x-ray magnetic circular dichroism at the Co-L-2,L-3 edges. The Co ions at both the octahedral Co-oct and trigonal Co-trig sites are found to be in a 3+ state. From the analysis of the dichroism we established a low-spin state for the Co-oct and a high-spin state with an anomalously large orbital moment of 1.7 mu(B) at the Co-trig(3+) ions. This large orbital moment along the c-axis chain and the unusually large magnetocrystalline anisotropy can be traced back to the double occupancy of the d(2) orbital in trigonal crystal field.

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