摘要
从理论上探讨了高Tc超导体的动态热膨胀反常行为对正常态和超导态分别用两组参数拟合实验数据，结果基本吻合与正常态相比，超导态的非谐性增强，原子间相互排斥的不对称性和声子的软化现象均增强。
The dynamic process of thermal expansion of Bi-based high-Tc superconductors is studied theoretically. For normal and superconducting states, two groups of parameters are obtained to fit the experimental data, the agreement is good. Compared with the normal state, the anharmonic effects are greatly enhanced in the superconducting state. Both of the asymmtry of the mutual repulsion of the atoms and phonon softening are enhanced in the superconducting state, especially, the increase of the softening of phonons is much more enormous, up to 103 magnitude. In the end, the mechanism of the high-Tc Superconductors is discussed preliminarily.
出处
《材料研究学报》
EI
CAS
CSCD
北大核心
1998年第2期159-162,共4页
Chinese Journal of Materials Research
基金
国家自然科学基金!59431040
中国博士后科学技术基金
辽宁省科学技术基金!428033
关键词
热膨胀
动态过程
超导体
高TC
铋系
超导电性
dynamic process of thermal expansion, high-T_c superconductor, anharmonic effect,phonon softening, polaron
