Nanoscale coherent intergrowthlike defects in a crystal of La1.9Ca1.1Cu2O6+δ made superconducting by high-pressure oxygen annealing
Hefei Hu, Yimei Zhu, Xiaoya Shi, Qiang Li, Ruidan Zhong, John A. Schneeloch, Genda Gu, John M. Tranquada, Simon J. L. Billinge
DOI 10.1103/PhysRevB.90.134518 · Physical Review B
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Abstract
Superconductivity with Tc=53.5 K has been induced in a large La1.9Ca1.1Cu2O6 (La-2126) single crystal by annealing in a high partial pressure of oxygen at 1200 °C. Using transmission electron microscopy techniques, we show that a secondary Ca-doped La2CuO4 (La-214) phase, not present in the as-grown crystal, appears as a coherent intergrowthlike defect as a consequence of the annealing. A corresponding secondary superconducting transition near 13 K is evident in the magnetization measurement. Electron energy-loss spectroscopy reveals a pre-edge peak at the O-K edge in the superconducting La-2126 phase, which is absent in the as-grown crystal, confirming the hole doping by interstitial oxygen.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| La1.9Ca1.1Cu2O6+δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 53.5 | Pressure not reported | onset |
| La2-xCaxCuO4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 13 | Pressure not reported | onset |
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