Optical spectroscopy study of the electronic structure of Eu1-xCaxB6 -: art. no. 075105

被引：18
|
作者：
Kim, JH
Lee, Y
Homes, CC
Rhyee, JS
Cho, BK
Oh, SJ
Choi, EJ [1 ]
机构：
[1] Seoul Natl Univ, Sch Phys, Ctr Strongly Correlated Mat Res, Seoul 151742, South Korea
[2] Univ Seoul, Dept Phys, Seoul 130743, South Korea
[3] Brookhaven Natl Lab, Dept Phys, Upton, NY 11973 USA
[4] K JIST, Ctr Frontier Mat, Kwangju 500712, South Korea
[5] K JIST, Dept Mat Sci & Engn, Kwangju 500712, South Korea
来源：
PHYSICAL REVIEW B | 2005年 / 71卷 / 07期
关键词：
D O I：
10.1103/PhysRevB.71.075105
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
The room temperature optical conductivity sigma(1)(omega) of Eu1-xCaxB6 has been obtained from reflectivity and ellipsometry measurements for a series of compositions, 0 <= x <= 1. The interband part of sigma(1)(omega) shifts continuously to higher frequency as Ca content x increases. Also the intraband spectral weight of sigma(1)(omega) decreases rapidly and essentially vanishes for x >= x(c)=0.35. These results show that the valence band and the conduction band of Eu1-xCaxB6 move away from each other such that their band overlap decreases with increasing Ca substitution. As a result, the electronic state evolves from the semimetallic structure of EuB6 to the insulating CaB6 where the two bands are separated to open a finite gap (similar or equal to 0.25 eV) at the X point of the Brillouin zone.
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页数：4
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