Possible existence of a Van Hove singularity near the Fermi surface of HgBa2CaCu2O6+

F. Chen, Z. J. Huang, R. L. Meng, Y. Y. Sun, C. W. Chu

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20 Citations (Scopus)


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 languageEnglish
Pages (from-to)16047-16050
Number of pages4
JournalPhysical Review B
Issue number21
Publication statusPublished - 1993

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics


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