Effect of Annealing on Optical Absorption of LaAlO3 at Terahertz Frequencies

被引：10
|
作者：
Nomura, Ken-ichi [1 ]
Okami, Shimpei [1 ]
Xie, Xiaojun [1 ,2 ]
Mizuno, Maya [3 ]
Fukunaga, Kaori [3 ]
Ohki, Yoshimichi [1 ]
机构：
[1] Waseda Univ, Dept Elect Engn & Biosci, Shinjuku Ku, Tokyo 1698555, Japan
[2] Xi An Jiao Tong Univ, State Key Lab Elect Insulat & Power Equipment, Xian 710049, Shaanxi, Peoples R China
[3] Natl Inst Informat & Commun Technol NICT, Tokyo 1848795, Japan
来源：
JAPANESE JOURNAL OF APPLIED PHYSICS | 2011年 / 50卷 / 02期
关键词：
PHONONS;
D O I：
10.1143/JJAP.50.021502
中图分类号：
O59 [应用物理学];
学科分类号：
摘要：
Absorption spectra of LaAlO3(100) single crystals were measured at frequencies from 1.0 to 3.5 THz. A new absorption peak appears at similar to 3.0 THz after annealing at temperatures above 500 degrees C. Simultaneously, striped domains with widths ranging from about 20 to about 300 mu m in the original samples completely disappeared. Since oxygen vacancies are assumed to play an important role in the formation of domains, the absorption peak at similar to 3.0 THz seems to be related to oxygen vacancies. (C) 2011 The Japan Society of Applied Physics
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页数：3
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