HIGH PRESSURE EFFECTS IN FLUORINATED HgBa2Ca2Cu3O8

M. MONTEVERDE, C. ACHA, M. NÚÑEZ-REGUEIRO, D. A. PAVLOV, K. A. LOKSHIN, S. N. PUTILIN AND E. V. ANTIPOV

EUROPHYSICS LETTERS

EDP

Lugar: Mulhouse; Año: 2005 vol. 72 p. 458 - 464

0295-5075

We have measured the pressure sensitivity of Tc in fluorinated HgBa2Ca2Cu3O8+δ (Hg-1223)ceramic samples with different F contents, applying pressures up to 30 GPa.W 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 fuorinated 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 axis is one of the keys that controls the Tc of high-temperature superconductors.