Physics – Condensed Matter – Superconductivity
Scientific paper
2000-03-31
Phys. Rev. Lett., 85 (2000) 2805
Physics
Condensed Matter
Superconductivity
4 pages (Revtex), 4 figures (PS), submitted to Physical Review Letters
Scientific paper
10.1103/PhysRevLett.85.2805
By measuring the superconducting diamagnetic moments for an underdoped and an overdoped La_{2-x}Sr_xCuO_4 single crystal with equal qualities and roughly equal transition temperatures, it is found that the underdoped sample has only one transition which corresponds to H_{c2}, but the overdoped sample has two transitions with the higher one at H_{c2}. Further investigation reveals the same upper-critical field H_{c2} for both samples although the overall charge densities are very different, indicating the possibility of a very direct and detailed equivalence of the superconducting condensation process in the two doping limits. The second transition for the overdoped sample can be understood as the bulk coupling between the superconducting clusters produced by macroscopic phase separation.
Chen Hua-Xing
Wen Huanyao
Yang Wen-Li
Zhao* Zhong-Xian
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