Local electronic structure and magnetic properties of LaMn0.5Co0.5O3 studied by x-ray absorption and magnetic circular dichroism spectroscopy

被引：186

作者：

Burnus, T. ^{[1
]}

Hu, Z. ^{[1
]}

Hsieh, H. H. ^{[2
]}

Joly, V. L. J. ^{[3
]}

Joy, P. A. ^{[3
]}

Haverkort, M. W. ^{[1
]}

Wu, Hua ^{[1
]}

Tanaka, A. ^{[4
]}

Lin, H. -J. ^{[5
]}

Chen, C. T. ^{[5
]}

Tjeng, L. H. ^{[1
]}

机构：

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

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

[3] Natl Chem Lab, Phys & Mat Chem Div, Pune 411008, Maharashtra, India

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

[5] Natl Synchrotron Radiat Res Ctr, Hsinchu 30076, Taiwan

来源：

PHYSICAL REVIEW B | 2008年 / 77卷 / 12期

关键词：

D O I：

10.1103/PhysRevB.77.125124

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We have studied the local electronic structure of LaMn0.5Co0.5O3 using soft-x-ray absorption spectroscopy at the Co-L-3,L-2 and Mn-L-3,L-2 edges. We found a high-spin Co2+-Mn4+ valence state for samples with the optimal Curie temperature. We discovered that samples with lower Curie temperatures contain low-spin nonmagnetic Co3+ ions. Using soft-x-ray magnetic circular dichroism, we established that the Co2+ and Mn4+ ions are ferromagnetically aligned. We also revealed that the Co2+ ions have a large orbital moment: morb/mspin approximate to 0.47. Together with model calculations, this suggests the presence of a large magnetocrystalline anisotropy in the material and predicts a nontrivial temperature dependence for the magnetic susceptibility.

引用

页数：7

共 62 条

[11] EXPERIMENTAL CONFIRMATION OF THE X-RAY MAGNETIC CIRCULAR-DICHROISM SUM-RULES FOR IRON AND COBALT [J].