Microstructure and the superconductivity in La2−x−ySrxNayCuO4 systems
Changjin Zhang, Liwei Liu, Li Lu, Yuheng Zhang
DOI 10.1103/PhysRevB.68.174505 · Physical Review B
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Abstract
The mechanism of high-temperature superconductivity is still an open question. Although the relationship between microstructure and superconductivity has been noticed in the early days, there is still lack of a definite explanation. In this paper we study the microstructure and the superconductivity of La2−yNayCuO4 samples and La1.85−ySr0.15NayCuO4 samples. It is surprising that the doping of Na+ does not introduce itinerant hole carriers into the CuO2 plane. All La2−yNayCuO4 samples show insulatorlike behavior just like La2CuO4. For La1.85−ySr0.15NayCuO4 samples, they exhibit superconductivity even at Na doping content y=0.30. We suggest that the microstructure directly dominates the carrier concentration in the CuO2 plane, so that it directly determines the occurrence of the superconductivity.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| La2-yNayCuO4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure unresolved | unknown |
| La1.85-ySr0.15NayCuO4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure unresolved | unknown |
| La2CuO4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
| La2-xSrxCuO4 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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