| Bi系高Tc超导体动态热膨胀反常行为理论初探 |
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| 引用本文： | 陈金玉,郭敬东,周本濂.Bi系高Tc超导体动态热膨胀反常行为理论初探[J].材料研究学报,1998,12(2):159-162. |
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| 作者姓名： | 陈金玉 郭敬东 周本濂 |
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| 作者单位： | 中国科学院金属研究所(陈金玉)，中国科学院国际材料物理中心(郭敬东)，沈阳师范学院(周本濂) |
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| 基金项目： | 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 |
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| 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，超导态的非诺性增强，原子间相互排斥的不对称性和声子的软化现象均增强，尤其是声子的软化更为显著。此结果有助于理解高Ｔｃ超导电性机理。
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| 关 键 词： | 热膨胀 动态过程 超导体 高Tc 铋系 超导电性 |
| 收稿时间： | 1998-04-25 |
| 修稿时间： | 1998-04-25 |
THE THEORETICAL STUDY OF DYNAMIC THERMAL EXPANSION OF Bi-BASED HIGH T_c SUPERCONDUCTORS |
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| CHEN Jinyu,GUO Jingdong,ZHOU Benlian.THE THEORETICAL STUDY OF DYNAMIC THERMAL EXPANSION OF Bi-BASED HIGH T_c SUPERCONDUCTORS[J].Chinese Journal of Materials Research,1998,12(2):159-162. |
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| Authors: | CHEN Jinyu GUO Jingdong ZHOU Benlian |
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| Affiliation: | CHEN Jinyu,GUO Jingdong,ZHOU Benlian(Institute of Metal Research,The Chinese Academy of Sciences,Shenyang )(International Center for Material Physics,The Chinese Academy of Sciences)(Shenyang Teachers' College ) |
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| Abstract: | 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. |
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| Keywords: | dynamic process of thermal expansion high-T_c superconductor anharmonic effect phonon softening polaron |
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