Which systems show decrease superconducting transition temperature with increase in applied pressure?
I am sure you will be able to find this in high TC materials and/or heavy fermion superconductors at suitable doping resp. composition. (I have no specific suggestion for you and would have to do a literature search for that... But since in their phase diagrams these materials exhibit a "superconducting dome" with optimum TC it only seems logic to me that applying pressure on one side of the dome will suppress TC almost for sure...
You can find decreasing Tc in systems like Pb, Sn and almost all elemental superconductors. Also MgB2 shows a decrease in Tc with pressure.
High Tc superconductors show a very different behaviour. In the cuprates (YBCO) you find that around 1/8 hole doping Tc is strongly enhanced by hydrostatic pressure, while at optimally doping Tc is almost independent of pressure.
In Pnictides it is however true that one can increase and decrease Tc by application of pressure depending on where in the phase-diagram one starts (see example of BaFe2As2 by Klintberg, et al. J. Phys. Soc. Jpn 2010)
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