首页 | 本学科首页   官方微博 | 高级检索  
     检索      


Effect of vacancies and interstitials on the dynamic properties of the La2−x SrxCuO4 superconductor
Authors:V G Chudinov  A G Chirkov  F A Sautin
Institution:(1) Physicotechnical Institute, Ural Branch of the Russian Academy of Sciences, 426001 Izhevsk, Russia
Abstract:The effect of vacancies and interstitials in the CuO2 layer on the vibrational spectrum in the La2−x SrxCuO4 system has been calculated by molecular dynamics. It is shown that the excitation probability for local ∼0.4-eV high-frequency vibrations of nonphonon origin in the vicinity of Sr impurity atoms decreases if copper vacancies are introduced at a concentration x=0.17, which corresponds to the maximum superconducting transition temperature, this decrease being still more effective (by about ten times) if interstitial atoms are present. The appearance of interstitials makes a considerable region around them (five to six nearest neighbors) quasi-amorphous. A comparison with available experimental data is made. It is concluded that the behavior of the system under irradiation is accounted for primarily by interstitials, which bring about strong perturbation in the lattice (∼1 nm) up to making it completely amorphous. Fiz. Tverd. Tela (St. Petersburg) 40, 984–988 (June 1998)
Keywords:
本文献已被 SpringerLink 等数据库收录!
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号