Spin transition in a four-coordinate iron oxide

被引：0

作者：

Kawakami T. ^{[1
]}

Tsujimoto Y. ^{[2
]}

Kageyama H. ^{[2
]}

Chen X.-Q. ^{[3
]}

Fu C.L. ^{[3
]}

Tassel C. ^{[2
]}

Kitada A. ^{[2
]}

Suto S. ^{[4
]}

Hirama K. ^{[4
]}

Sekiya Y. ^{[4
]}

Makino Y. ^{[4
]}

Okada T. ^{[5
]}

Yagi T. ^{[5
]}

Hayashi N. ^{[6
]}

Yoshimura K. ^{[2
]}

Nasu S. ^{[7
]}

Podloucky R. ^{[8
]}

Takano M. ^{[9
]}

机构：

[1] Institute of Quantum Science, Nihon University, Chiyoda

[2] Department of Chemistry, Graduate School of Science, Kyoto University, Sakyo

[3] Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge

[4] Graduate School of Quantum Science and Technology, Nihon University, Chiyoda

[5] Institute for Solid State Physics, University of Tokyo, Kashiwa

[6] Graduate School of Human and Environmental Studies, Kyoto University, Sakyo

[7] Institute for Chemical Research, Kyoto University, Uji

[8] Institute of Physical Chemistry, University of Vienna, Wien

[9] Institute for Integrated Cell-Material Sciences, Kyoto University, Sakyo, Kyoto 606-0801, Yoshida Ushinomita-cho

来源：

Nature Chemistry | 2009年 / 1卷 / 5期

关键词：

D O I：

10.1038/nchem.289

中图分类号：

学科分类号：

摘要：

Spin transition has attracted the interest of researchers in various fields since the early 1930s, with thousands of examples now recognized, including those in minerals and biomolecules. However, so far the metal centres in which it has been found to occur are almost always octahedral six-coordinate 3d 4 to 3d 7 metals, such as Fe(II). A five-coordinate centre is only rarely seen. Here we report that under pressure SrFe(II)O 2, which features a four-fold square-planar coordination, exhibits a transition from high spin (S=2) to intermediate spin (S=1). This is accompanied by a transition from an antiferromagnetic insulating state to a ferromagnetic so-called half-metallic state: only half of the spin-down (d xz,d yz) states are filled. These results highlight the square-planar coordinated iron oxides as a new class of magnetic and electric materials. © 2009 Macmillan Publishers Limited. All rights reserved.

引用

页码：371 / 376

页数：5

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