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Macroscopic phase separation in high-temperature superconductors.

H H Wen1

  • 1National Laboratory for Superconductivity, Institute of Physics and Center for Condensed Matter Physics, Chinese Academy of Sciences, P. O. Box 603, Beijing 100080, People's Republic of China.

Proceedings of the National Academy of Sciences of the United States of America
|October 12, 2000
PubMed
Summary
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Extra holes restore high-temperature superconductivity in Cu-O planes. This study reveals electronic phase separation and inhomogeneity in overdoped superconductors, likely a general feature of these materials.

Area of Science:

  • Condensed Matter Physics
  • Materials Science

Background:

  • High-temperature superconductivity emerges in cuprates upon doping.
  • Initially, copper-oxygen (Cu-O) planes exhibit insulating antiferromagnetism.

Purpose of the Study:

  • To investigate macroscopic electronic phase separation.
  • To determine the cause of electronic inhomogeneity in overdoped superconductors.

Main Methods:

  • Analysis of experimental data on overdoped high-temperature superconductors.
  • Examination of effects of mobile doping and electronic instability.

Main Results:

  • Macroscopic electronic phase separation observed in the overdoped region.
  • Electronic inhomogeneity identified as a key characteristic.

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Conclusions:

  • Electronic inhomogeneity is likely a general property of high-temperature superconductors.
  • Phase separation is driven by doping or electronic instability.