Microscopic phase separation in La2CuO4+x induced by the superconducting transition
V. Yu. Pomjakushin, A. A. Zakharov, A. M. Balagurov, F. N. Gygax, A. Schenck, A. Amato, D. Herlach, A. I. Beskrovny, V. N. Duginov, Yu. V. Obukhov, A. N. Ponomarev, S. N. Barilo
DOI 10.1103/PhysRevB.58.12350 · Physical Review B
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Abstract
The phase separation (PS) effect in superconducting La2CuO4+x (x<~0.04) single crystals with low oxygen mobility was studied via μSR spectroscopy, high-resolution neutron diffraction, and magnetic susceptibility. Despite the fact that all crystals are inside the miscibility gap (0.01<x<0.06), only crystals with a sufficiently large excess oxygen concentration x=0.04 show a macroscopic phase separation according to the neutron-diffraction data. However, in all samples a phase transition to an ordered magnetic state was observed by μSR spectroscopy concomitantly with the onset of superconductivity. This effect is treated as a microscopic phase separation which is possibly driven by superconductivity.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| La2CuO4.02 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 15 | Pressure not reported | onset |
| La2CuO4.04 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 25 | Pressure not reported | unknown |
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