| Original Articles |
|
|
|
|
Relationship Between Cohesive Energy and Superconductivity in Hg-System Superconductors |
| QIN Xiao-chuan;DU Xu;ZHANG Han |
| Materials Physics Laboratory, State Key Laboratory for Aritificial Microstructure and Mesoscope Physics, Department of Physics, Peking University, Beijing 100871 |
|
| Cite this article: |
|
QIN Xiao-chuan, DU Xu, ZHANG Han 1998 Chin. Phys. Lett. 15 745-747 |
|
|
|
|
Abstract Calculation of cohesive energy on Hg-system superconductors HgBa2CuOy(1201), HgBa2CaCu2Oy(1212), HgBa2Ca2Cu3Oy(1223), HgBa2Ca3Cu4Oy(1234), and HgBa2Ca4Cu5Oy (1245) has been made. A program was developed to claculate the combinative energy between Cu-O planes and remaining parts, and between blocks in the superconductors. The result indicates that if the cell is considered as the two blocks combined together, a close relationship among the combinative energy of the two blocks, the value of Tc, and the number of the Cu-O planes in the Hg-system superconductors is established. The result gives a new way to understand the change of the value of Tc, as the number of the Cu-O planes. In contrast, the combinative energy between the Cu-O planes and the remains got from the method separating all the Cu-O planes from the cell and leaving some discrete remaining parts does not show any relationship with the value of Tc. This means that considering the cell as the two blocks in more reasonable, and the interaction between the two blocks plays an important role in superconductivity.
|
| Keywords:
74.25.-q
74.80.-g
74.80.Dm
|
|
|
Published: 01 October 1998
|
|
|
|
|
|
|
|
|
Viewed |
|
|
|
Full text
|
|
|
|
|
Abstract
|
|
|
|
|
