Phase separation effect in cuprate superconductors
J. Wang, D. Y. Xing, Jinming Dong, P. H. Hor
DOI 10.1103/PhysRevB.62.9827 · Physical Review B
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Abstract
In terms of the Ginzburg-Landau theory, we investigate the effect of coupling between the paramagnet-antiferromagnet (AF) phase transition, superconducting (SC) phase transition, and phase separation (PS) of doping holes in cuprate superconductors. It is found that in the presence of PS, the hole-rich metallic phase can coexist with the hole-poor insulating AF phase, and there is a metal-insulator transition with increasing doping concentration n beyond a percolation threshold. The occurrence of PS will lead to significant changes in the phase diagram: the SC phase appearing at lower n and the step dependence of Tc on n. These results are qualitatively consistent with experiments of photodoped and oxygen-doped cuprate perovskites.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| La2CuO4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
| La2CuO4-y Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 30 | Pressure not reported | unknown |
| La1.94Sr0.06CuO4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
| YBa2Cu3O6.3 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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