Same Superconducting Criticality for Underdoped and Overdoped La2−xSrxCuO4 Single Crystals
H. H. Wen, X. H. Chen, W. L. Yang, Z. X. Zhao
DOI 10.1103/PhysRevLett.85.2805 · Physical Review Letters
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Abstract
By measuring the superconducting diamagnetic moments for an underdoped and an overdoped La2−xSrxCuO4 single crystal with equal quality and roughly equal transition temperatures, it is found that the underdoped sample has only one transition which corresponds to Hc2, but the overdoped sample has two transitions with the higher one at Hc2. Further investigation reveals the same upper-critical field Hc2 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.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| La2-xSrxCuO4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 26 | Pressure not reported | onset |
| La2-xSrxCuO4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 25 | Pressure not reported | onset |
| Bi2Sr2-xLaxCuO6-y Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
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