Pressure Dependence of Tc in Tl2Ba2CaCu2O8 at Hydrostatic Pressures to 6 GPa

Studies of the pressure dependencies of the critical temperatures of hole-doped high Tc superconductors in the past have demonstrated, with very few exceptions, monotonically increasing Tc's with increasing pressure. This is thought to be due to the pressure-induced injection of holes onto the...

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Bibliographic Details
Main Authors: Moulton, N E, Wolf, S A, Skelton, E F, Liebenberg, D H
Format: Report
Language:English
Subjects:
CONCENTRATION(CHEMISTRY)
Electrical and Electronic Equipment
HYDROSTATIC PRESSURE
OXYGEN
PRESSURE
REDUCTION
SHARPNESS
SUPERCONDUCTORS
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Summary:Studies of the pressure dependencies of the critical temperatures of hole-doped high Tc superconductors in the past have demonstrated, with very few exceptions, monotonically increasing Tc's with increasing pressure. This is thought to be due to the pressure-induced injection of holes onto the conduction planes resulting from a change in the apical Cu-O bond length, a view consistent with the drop of critical temperature with decreasing oxygen concentration and hence decreasing hole concentration. Recently work has been performed which indicates that for many of the thallium-based cuprates, increases in the oxygen content in as-made samples, actually decreases Tc, while decreases in oxygen content produce sharp increases in Tc, followed by decreases with further oxygen reduction.