Epitaxial Strain and Superconductivity in La2−xSrxCuO4 Thin Films
I. Bozovic, G. Logvenov, I. Belca, B. Narimbetov, I. Sveklo
DOI 10.1103/PhysRevLett.89.107001 · Physical Review Letters
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Abstract
The report that Tc was doubled in underdoped La2−xSrxCuO4 films under compressive epitaxial strain has stirred great interest. We show that such films are extremely sensitive to oxygen intake, even at very low temperature, with startling consequences including colossal lattice expansion and a crossover from semiconductor to metallic behavior. We can bring Tc up to 40 K in La2CuO4 films on SrTiO3 substrates—without any Sr doping and under tensile strain. On LaSrAlO4 substrates, we reached Tc=51.5 K, the highest so far in La2−xSrxCuO4.
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. | 40 | Pressure not reported | zero_resistance |
| La2CuO4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 48 | Pressure not reported | zero_resistance |
| La1.9Sr0.1CuO4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 49.1 | Pressure not reported | unknown |
| La1.9Sr0.1CuO4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 25 | Pressure not reported | unknown |
| HgBa2Ca2Cu3O8 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 134 | 0.0001 GPa | unknown |
| HgBa2Ca2Cu3O8 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 160 | 31 GPa | unknown |
| La2-xSrxCuO4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 51.5 | Pressure not reported | zero_resistance |
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