A POSSIBLE SOLITON-LIKE POLARON MODEL FOR SUPERCONDUCTORS Y1-xCaxBa2Cu3-xMxO7-$\delta$(M=Fe, Ni)
Wang Yi (王忆)a, Chen Chuan-yu (陈传誉)a, Huang Xiao-wu (黄效吾)b, Wang Ke-lin (汪克林)c
a Department of Physics, Guangzhou Teachers College, Guangzhou 510400, China; b Department of Physics, Anhui University, Hefei 230039, China; c Center for Fundamental Physics, University of Science and Technology of China, Hefei 230026, China
Abstract Using 1+1 soliton-like polaron model of a deformable continuum, the critical temperature and the energy gap in high-temperature superconductors Y1-xCaxBa2Cu3-xMxO7-$\delta$(M=Fe, Ni) are studied in the framework of finite temperature Green's function theory. The ratio 2$\varDelta$/kBTc=3.9 is obtained. Theoretical results are found in good agreement with the experimental data.
Received: 15 July 1998
Revised: 22 October 1998
Accepted manuscript online:
Fund: Project supported by the National Natural Science Foundation of China (Grant No. 19804009), and the Natural Science Foundation of Guangdong Province (Grant No. 974199), China.
Cite this article:
Wang Yi (王忆), Chen Chuan-yu (陈传誉), Huang Xiao-wu (黄效吾), Wang Ke-lin (汪克林) A POSSIBLE SOLITON-LIKE POLARON MODEL FOR SUPERCONDUCTORS Y1-xCaxBa2Cu3-xMxO7-$\delta$(M=Fe, Ni) 1999 Acta Physica Sinica (Overseas Edition) 8 193
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