1. 50 K enhancement of Tc by pressure in the Hg-2212 superconductor
- Author
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J.L. Tholence, Manuel Núñez-Regueiro, M. Marezio, Catherine Chaillout, Carlos Acha, J.J. Capponi, and Sergio Paulo Martins Loureiro
- Subjects
Superconductivity ,Chemistry ,Transition temperature ,Doping ,Analytical chemistry ,General Chemistry ,Condensed Matter Physics ,Magnetic susceptibility ,Electrical resistivity and conductivity ,Materials Chemistry ,Cuprate ,Total pressure ,Ambient pressure ,Nuclear chemistry - Abstract
The superconducting properties of mercury cuprates are extremely sensitive to compression. The highest transition temperatures obtained up to date have been measured on Hg-1223 at 25–30 Gpa ( T c ∼ 164 K at the onset) and imply an increase of about 20 K with respect to the ambient pressure T c 0 . We report here the largest total pressure effect (> 50 K over a span of 20 GPa) ever observed for several samples of bi-mercury layer Hg 2 Ba 2 (Y 1− x Ca x )Cu 2 O 8−δ compositions. Different Ca doping levels give different initial T c s but retain the same strong pressure dependence. The large T c increase with pressure for all the Hg-based compounds, independently of their doping level, is revealing the existence of a common structural parameter, which identification will be a guide for future synthesis efforts of record-high T c materials.
- Published
- 1997