Superconducting superoxygenated cuprates: Search for phase separation in La1.84Sr0.16CuO4+δ
B. Morosin, G. H. Kwei, J. E. Schirber, J. A. Voigt, E. L. Venturini, J. A. Goldstone
DOI 10.1103/PhysRevB.44.7673 · Physical Review B
Active bibliographic source — not scientific approval
Bibliographic access preserves source history; it does not approve extracted materials or validate reported claims. Review warnings on each occurrence separately.
Abstract
We have studied high-pressure (2.3 kbar), high-temperature (575 °C), oxygen-annealed ceramic La1.84Sr0.16CuO4+δ by high-resolution neutron powder diffraction to determine its low-temperature structural properties in comparison to similarly oxygenated La2CuO4+δ. Unlike La2CuO4+δ, the Sr-containing superconductor shows no low-temperature phase separation. Further, the interstitial oxygen appears to be located at (1/4,1/4,z) with z=0.163(5) and to have a value of δ consistent with La1.84Sr0.16CuO4.019. Such a site is significantly displaced away from the interstitial location, (1/4,1/4,z), with z=0.25, observed in La2CuO4+δ and La2NiO4+δ. The environment of such an interstitial site is suggestive of a smaller, neutral oxygen rather than a charged species.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| La1.84Sr0.16CuO4+δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 37.5 | Pressure unresolved | onset |
| La1.84Sr0.16CuO4+δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 38 | Pressure unresolved | onset |
| La1.84Sr0.16CuO4+δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 39.5 | Pressure not reported | onset |
| La1.85Sr0.15CuO4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
Similar papers
Quantum structural parameters for electron- and hole-carrying copper oxide superconductors
similarity 0.97Kalpana Katti & Subhash H. Risbud
Source status unknown — claims are unverified
Doping dependence of the spatially modulated dynamical spin correlations and the superconducting-transition temperature in La2−xSrxCuO4
similarity 0.97K. Yamada et al.
Source status unknown — claims are unverified
Extended x-ray-absorption fine-structure study of La2−xSrxCuO4−y superconductors
similarity 0.96J. M. Tranquada et al.
Source status unknown — claims are unverified
Toward a unified magnetic phase diagram of the cuprate superconductors
similarity 0.96Alexander Sokol & David Pines
Source status unknown — claims are unverified
Magnetic dynamics of superconducting La1.86Sr0.14CuO4
similarity 0.96T. E. Mason et al.
Source status unknown — claims are unverified
Complementary Response of Static Spin-Stripe Order and Superconductivity to Nonmagnetic Impurities in Cuprates
similarity 0.96Z. Guguchia et al.
Source status unknown — claims are unverified