Anisotropic excitons in MgB2 from orientation-dependent electron-energy-loss spectroscopy -: art. no. 172502

被引：18
|
作者：
Jiang, N [1 ]
Jiang, B
Spence, JCH
Yu, RC
Li, SC
Jin, CQ
机构：
[1] Arizona State Univ, Dept Phys & Astron, Tempe, AZ 85187 USA
[2] Chinese Acad Sci, Ctr Condensed Matter Phys, Inst Phys, Lab Extreme Condit Phys, Beijing 100864, Peoples R China
来源：
PHYSICAL REVIEW B | 2002年 / 66卷 / 17期
关键词：
D O I：
10.1103/PhysRevB.66.172502
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
The momentum transfer in electron-energy-loss spectra (EELS) recorded in an electron microscope can be controlled in a manner akin to polarization-dependent soft-x-ray absorption spectroscopy, however with much greater spatial resolution. Here we report orientation-dependent EELS from fine-grained MgB2 for both B K and Mg L-2,L-3 edges. Calculations based on an excited final state are used to suggest an anisotropic exciton for the peak at 55 eV at the Mg L-23 edge.
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页码：1 / 4
页数：4
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