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Effect of pressure and of oxygen content on superconductivity in the cuprate HgBa2CuO4+δ. A quantitative analysis based on indirect-exchange pairing

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  • Jansen, L.
  • Block, R.

Abstract

A quantitative analysis is presented of experimental pressure and oxygen-doping effects on the critical temperature of HgBa2CuO4+δ over a wide range of δ, covering both under- and overdoped compositions, on the basis of indirect-exchange pairing between conduction electrons via oxygen anions. The results clearly show that for δ ⩽ 0.28, the oxygen doping process is not the same as cation doping in e.g. La2−xSrxCuO4: part of the doped oxygen fulfills a double role as hole dopant and as Cooper pair mediator. Furthermore, adding or extracting oxygen under experimental conditions is accompanied by a redistribution of oxygen anions in the unit cell, to or from the neighborhood of the CuO2 layer. This effect explains the surprisingly wide range of superconducting compositions (0.03 ⩽ δ ⩽ 0.40) of the system. The observed, anomalous, upward shift in thermoelectric power for δ />/ 0.28 is attributed to different sites of doped oxygen beyond that limit, affecting only hole conductivity.

Suggested Citation

  • Jansen, L. & Block, R., 1996. "Effect of pressure and of oxygen content on superconductivity in the cuprate HgBa2CuO4+δ. A quantitative analysis based on indirect-exchange pairing," Physica A: Statistical Mechanics and its Applications, Elsevier, vol. 230(3), pages 467-483.
    • Handle: RePEc:eee:phsmap:v:230:y:1996:i:3:p:467-483
    DOI: 10.1016/0378-4371(96)00095-7
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    1. Jansen, Laurens & Block, Ruud & Stepankin, Vladimir, 1995. "Analysis of superconductivity in Ba1−xKxBiO3 on the basis of indirect-exchange mediated pairing," Physica A: Statistical Mechanics and its Applications, Elsevier, vol. 219(3), pages 327-350.
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