Superconducting properties of La2−xBixCuO4+δ: Suppression of the phase separation observed for La2CuO4+δ
Zenji Hiroi, Mikio Takano, Yoshichika Bando, Atsushi Sato, Yasuo Takeda
DOI 10.1103/PhysRevB.46.14857 · Physical Review B
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Abstract
Superconducting properties of a solid solution, La2−xBixCuO4+δ (0≤x≤0.2), treated at high oxygen pressures were studied by dc magnetic-susceptibility measurements. A remarkably large superconducting volume fraction of up to ∼10% was found for x>0, though La2CuO4+δ (x=0), which oxygenated under the same conditions, showed a fraction of at most 0.2%. These results have been discussed in relation to the phase separation in La2CuO4+δ suggested by Jorgensen et al. The Bi-for-La substitution should introduce a random potential for the interstitial oxygen atoms and, thereby, suppress the segregation of the excess oxygen atoms. The large superconducting volume then results from the uniform oxygen distribution.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| La2-xBixCuO4+δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 25 | Pressure not reported | onset |
| La2-xBixCuO4+δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 25 | Pressure not reported | onset |
| La2CuO4+δ 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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