Crystal structure of the high-temperature superconductor La1.85Sr0.15CuO4 above and below Tc
R. J. Cava, A. Santoro, D. W. Johnson, Jr., W. W. Rhodes
DOI 10.1103/PhysRevB.35.6716 · Physical Review B
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Abstract
The crystal structure of La1.85Sr0.15CuO4 has been determined at 300, 60, and 10 K by neutron diffraction powder profile analysis. The structure is of the tetragonal K2NiF4 type at ambient temperature, but undergoes an orthorhombic distortion near 200 K which buckles the copper-oxygen planes. The crystal structure of the orthorhombic phase is not significantly different above and below Tc. The copper-oxygen coordination polyhedron changes shape in a subtle manner at the tetragonal-to-orthorhombic phase transition, but is unchanged at Tc.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| La1.85Sr0.15CuO4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 37.5 | Pressure not reported | unknown |
| La2-xBaCuO4-y Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
| La2-xSrxCuO4-y Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 40 | Pressure not reported | unknown |
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