Valence values of the cations in selenospinel Cu(Cr, Ti) 2Se4

被引：13

作者：

Noh, H. J. ^{[1
]}

Kang, J. S.

Lee, S. S.

Kim, G.

Han, S. W.

Oh, S. J.

Kim, J. Y.

Lee, H. G.

Yeo, S.

Guha, S.

Cheong, S. W.

机构：

[1] Chonnam Natl Univ, Dept Phys, Kwangju 500757, South Korea

[2] Catholic Univ Korea, Dept Phys, Puchon 420743, South Korea

[3] Seoul Natl Univ, Sch Phys, Seoul 151742, South Korea

[4] Seoul Natl Univ, Ctr Strongly Correlated Mat Res, Seoul 151742, South Korea

[5] Pohang Univ Sci & Technol, Pohang Accelerator Lab, Pohang 790784, South Korea

[6] Rutgers State Univ, Dept Phys & Astron, Piscataway, NJ 08854 USA

[7] Rutgers Ctr Emergent Mat, Piscataway, NJ 08854 USA

来源：

EPL | 2007年 / 78卷 / 02期

关键词：

D O I：

10.1209/0295-5075/78/27004

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

A long-standing issue about the Cu valency in selenospinel CuCr2Se4 was investigated by soft X-ray absorption spectroscopy (XAS) and magnetic circular dichroism (XMCD). Using the sensitivity of XAS and XMCD to the valence value of transition metal ion and its local symmetry, we checked the valence value of each cation in selenospinel CuCrxTi2-xSe4 (x = 1.0, 1.1, 1.5, and 2.0) and obtained spectroscopic evidence that a small amount of the Cu cation changes the valency from Cu(I) to Cu(II) as the Cr concentration increases from 1.0 to 2.0. Dependence of the Cu( II) concentration and the mean field magnetic exchange energy on the Cr concentration suggests the Cu d-hole could play a crucial role in the intriguing magnetic/electrical properties of CuCr2Se4. Copyright (C) EPLA, 2007.

引用

页数：6

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