Abstract
The superconducting transition temperatures (Tcs) of HgBa2CaCu2O6+ with different dopings and different ambient Tcs were examined magnetically under hydrostatic pressures. We observed that Tc increases with pressure linearly at a rate of 0.220.02 K/kbar up to 18 kbar for as-synthesized samples with an ambient Tc111 K, but at a similar initial rate only below 4 kbar, and at a reduced rate of 0.110.02 K/kbar above, for the oxygenated samples with an ambient Tc117 K. The observation suggests the possible existence of a Van Hove singularity in the electronic energy spectrum of HgBa2CaCu2O6+ and a possible pressure-induced Fermi-surface-topology change in the oxygenated compound.
Original language | English |
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Pages (from-to) | 16047-16050 |
Number of pages | 4 |
Journal | Physical Review B |
Volume | 48 |
Issue number | 21 |
DOIs | |
Publication status | Published - 1993 |
All Science Journal Classification (ASJC) codes
- Condensed Matter Physics