Dependence of Superconducting Transition Temperature on Doping and Structural Distortion of the CuO2 Planes in La2−xMxCuO4 (M = Nd, Ca, Sr)
B. Dabrowski, Z. Wang, K. Rogacki, J. D. Jorgensen, R. L. Hitterman, J. L. Wagner, B. A. Hunter, P. G. Radaelli, D. G. Hinks
DOI 10.1103/PhysRevLett.76.1348 · Physical Review Letters
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Abstract
By comparing structural and superconducting properties of La2−x−yCaxNdyCuO4 to La2−xSrxCuO4 we have separated the effects of structure and doping on the superconducting Tc. At a fixed doping level, the highest Tc is found for flat and square CuO2 planes in the tetragonal structure. Tc is reduced by the structural distortions of the CuO2 planes in the orthorhombic structure. The local minimum of Tc vs doping observed around x∼0.12 indicates the presence of a weakly split singularity of the electronic density of states for the orthorhombic material.
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. | 38 | Pressure unresolved | midpoint |
| La2-xSrxCuO4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 42 | 2 GPa | midpoint |
| La2-xCaxCuO4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure unresolved | midpoint |
| La1.85-yCa0.15NdyCuO4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure unresolved | midpoint |
| La1.85Ba0.15CuO4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 27 | Pressure not reported | unknown |
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