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Journal of Low Temperature Physics

, Volume 99, Issue 3–4, pp 251–262 | Cite as

Recent advances in raisingT c and establishing the gap-symmetry of high-T c cuprate superconductors

  • H. R. Ott
  • D. A. Brawner
  • A. Schilling
Experimental Facts

Abstract

The most recent attempts in raising Tc of cuprate superconductors were successful by synthesizing new Hg-based cuprate materials. We discuss some properties of materials from this series with varying numbers of Cu-O planes per unit cell, including the considerable rise of the critical temperature under the influence of external pressure.

In the second part of this contribution, various attempts to directly determine the symmetry of the superconducting order parameter of high-Tc cuprates are mentioned and set into perspective. The experimental approaches are all based on probing the phase of the order parameter in suitably connected closed superconducting loops. The evidence for unconventional order-parameter symmetry in these materials is growing.

PACS numbers

74.72.−h 74.62.−c 74.90.+n 

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Copyright information

© Plenum Publishing Corporation 1995

Authors and Affiliations

  • H. R. Ott
    • 1
  • D. A. Brawner
    • 1
  • A. Schilling
    • 1
  1. 1.Laboratorium für FestkörperphysikETH HönggerbergZürichSwitzerland

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