Terahertz spin-orbital excitations in the paramagnetic state of multiferroic Sr2FeSi2O7

被引：12

作者：

Mai, Thuc T. ^{[1
]}

Svoboda, C. ^{[1
]}

Warren, M. T. ^{[1
]}

Jang, T. -H. ^{[2
,3
,4
]}

Brangham, J. ^{[1
]}

Jeong, Y. H. ^{[2
]}

Cheong, S. -W. ^{[3
,4
,5
,6
]}

Aguilar, R. Valdes ^{[1
]}

机构：

[1] Ohio State Univ, Ctr Emergent Mat, Dept Phys, Columbus, OH 43210 USA

[2] Pohang Univ Sci & Technol, Dept Phys, Pohang 37673, South Korea

[3] Pohang Univ Sci & Technol, Lab Pohang Emergent Mat, Pohang 37673, South Korea

[4] Pohang Univ Sci & Technol, Max Plank POSTECH Ctr Complex Phase Mat, Pohang 37673, South Korea

[5] Rutgers State Univ, Rutgers Ctr Emergent Mat, Piscataway, NJ 08854 USA

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

来源：

PHYSICAL REVIEW B | 2016年 / 94卷 / 22期

关键词：

D O I：

10.1103/PhysRevB.94.224416

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We studied the novel multiferroic material Sr2FeSi2O7 and found three absorption modes above the magnetic ordering transition temperature using time-domain terahertz spectroscopy. These absorption modes can be explained as the optical transitions between the spin-orbit coupling and crystal-field split 3d(6) Fe2+ ground-state term in this material. Consideration of the compressed tetrahedral environment of the Fe2+ site is crucial to understand the excitations. We point out, however, discrepancies between the single-site atomic picture and the experimental results.

引用

页数：5

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