Pressure studies on the pseudogap and critical temperatures of a high-<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi>T</mml:mi></mml:mrow><mml:mrow><mml:mi>c</mml:mi></mml:mrow></mml:msub></mml:mrow></mml:math>superconductor

We report simultaneous hydrostatic pressure studies on the critical temperature ${T}_{c}$ and on the pseudogap temperature ${T}^{*}$ performed through resistivity measurements on an optimally doped high-${T}_{c}$ oxide ${\mathrm{Hg}}_{0.82}{\mathrm{Re}}_{0.18}{\mathrm{Ba}}_{2}{\mathrm{Ca}}_{2}{\mathrm{Cu}}_{3}{\mathrm{O}}_{8+\ensuremath{\delta}}.$ The resistivity is measured as a function of the temperature for several different applied pressures around 1 GPa. We find that ${T}^{*}$ increases linearly with the pressure at a larger rate than ${T}_{c}.$ This result demonstrates that the well known intrinsic pressure effect on ${T}_{c}$ is more important at the pair formation temperature ${T}^{*}.$

Not yet translated