High pressure effects in fluorinated HgBa2Ca2Cu3O(8+d)

Abstract

We have measured the pressure sensitivity of Tc in fluorinated HgBa2Ca2Cu3O(8+d) (Hg-1223) ceramic samples with different F contents, applying pressures up to 30 GPa. We obtained that Tc increases with increasing pressure, reaching different maximum values, depending on the F doping level, and decreases for a further increase of pressure. A new high Tc record (166 K +/- 1 K) was achieved by applying pressure (23 GPa) in a fluorinated Hg-1223 sample near the optimum doping level. Our results show that all our samples are at the optimal doping, and that fluorine incorporation decreases the crystallographic $a$-parameter concomitantly increasing the maximum attainable Tc. This effect reveals that the compression of the $a$ axes is one of the keys that controls the Tc of high temperature superconductors.

4 pages, 4 figures, submitted to Phys. Rev. B

References in corpus (3)

• Band-structure trend in hole-doped cuprates and correlation with Tcmax
• An explanation for a universality of transition temperatures in families of copper oxide superconductors
• The extended Hubbard model applied to study the pressure effects for High Temperature Superconductors

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