摘要
采用Ｒｅｃｕｒｓｉｏｎ方法计算了常压和１ＧＰａ、４ＧＰａ、８ＧＰａ高压下Ｌａ＿（１．８５）Ｓｒ＿（０．１５）ＣｕＯ＿４的电子结构，给出了费米能、费米能处态密度以及各晶位原子价的定量变化。结果表明：高压下Ｔ＿ｃ的变化可能源于ＣｕＯ＿２面上氧空穴和铜空穴数目的改变，且氧空穴数目的增加有利于超导性。
The electronic structure of La_(1.85)Sr_(0.15)CuO_4 under atmosphere, 1GPa, 4GPa,8GPa has been calculated by the Recursion method. The changes of Fermi energy, total densitydstates at E_F, atomic valence at each site are given. Our results show that the change of T_c underhigh pressure is not du to the change of E_F or N (E_F), but may be caused by the variation of holenumber of Cu and O2 on the CuO_2 plane. The rise Of O2 p holes is favorable for superconductiv-ity in this system.
出处
《高压物理学报》
CAS
CSCD
北大核心
1994年第1期1-8,共8页
Chinese Journal of High Pressure Physics
基金
中国教育博士基金及北京大学计算中心资助
关键词
超导体
高温超导性
高压
电子结构
electronic density of states, band width, Fermi surface, atomic valence, holeconcentration.
