Lattice instabilities and the effect of copper-oxygen-sheet distortions on superconductivity in doped La2CuO4
M. K. Crawford, R. L. Harlow, E. M. McCarron, W. E. Farneth, J. D. Axe, H. Chou, Q. Huang
DOI 10.1103/PhysRevB.44.7749 · Physical Review B
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Abstract
Synchrotron x-ray and neutron-diffraction measurements demonstrate that Nd3+ substitution at the La3+ site in both metallic and insulating La2−xSrxCuO4 induces low-temperature structural instabilities which reorient the tilting of the copper-oxygen octahedra. These structural transformations strongly affect superconductivity. In addition, there is a bicritical point involving phases of Bmab, Pccn, and P42/ncm space-group symmetries in the structural phase diagram of La1.6−xNd0.4SrxCuO4 at x∼0.15. There are also anomalies in the structural transformation temperatures and the superconducting transition temperatures when x∼1/8, providing evidence for an electronic instability at this doping level.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| La1.88-xNdxSro.12CuO4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
| La1.6-xNdo.4SrxCuO4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
| La1.88Ba0.12CuO4 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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