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Open Access Publications from the University of California

Onset of superconductivity at 107K in YBa2Cu3O7 - δ at high pressure

  • Author(s): McElfresh, MW
  • Maple, MB
  • Yang, KN
  • Fisk, Z
  • et al.

Electrical resistivity ρ measurements under pressure have been carried out on the high-temperature superconductor YBa2Cu3O7 - δ as a function of temperature T between 1 and 300 K at various pressures between 8 kbar and 149 kbar. The superconducting transition temperature Tc increases almost linearly with pressure at the rate dTc/dP ∼- 0.13 K/kbar. The onset of Tc, defined as the temperature at which ρ(T) drops to 90% of its extrapolated normal state value, increases from ∼95 K at 8 kbar to 107 K at 149 kbar. These results suggest that higher pressures will yield yet higher values of Tc. © 1988 Springer-Verlag.

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