Oxygen isotope effect on the superconductivity and stripe phase in La1.6−xNd0.4SrxCuO4
G. Y. Wang, J. D. Zhang, R. L. Yang, X. H. Chen
DOI 10.1103/PhysRevB.75.212503 · Physical Review B
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Abstract
The oxygen isotope effect on the superconductivity, stripe phase, and structure transition is systematically investigated in La1.6−xNd0.4SrxCuO4 with static stripe phase. Substitution of O16 by O18 leads to a decrease in superconducting transition temperature TC while enhancing the temperature of the structural transition from low-temperature-orthorhombic phase to low-temperature-tetragonal phase. Compared to the Nd-free sample, a larger isotope effect on TC is observed in La1.6−xNd0.4SrxCuO4. These results indicate that the distortion of CuO2 plane suppresses the superconductivity, giving a direct evidence of the competition of stripe phase and superconductivity because the distortion of CuO2 plane enhances the stripe phase.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| La1.5Nd0.4Sr0.1CuO4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 11 | Pressure unresolved | midpoint |
| La1.475Nd0.4Sr0.125CuO4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 7.9 | Pressure unresolved | midpoint |
| La1.45Nd0.4Sr0.15CuO4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 17.8 | Pressure unresolved | midpoint |
| La1.425Nd0.4Sr0.175CuO4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 25 | Pressure unresolved | midpoint |
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