  Here we report the observation of superconductivity in pressurized type-II
Weyl semimetal (WSM) candidate TaIrTe4 by means of complementary high-pressure
transport and synchrotron X-ray diffraction measurements. We find that TaIrTe4
shows superconductivity with transition temperature (TC) of 0.57 K at the
pressure of ~23.8 GPa. Then, the TC value increases with pressure and reaches
~2.1 K at 65.7 GPa. In situ high-pressure Hall coefficient (RH) measurements at
low temperatures demonstrate that the positive RH increases with pressure until
the critical pressure of the superconducting transition is reached, but starts
to decrease upon further increasing pressure. Above the critical pressure, the
positive magnetoresistance effect disappears simultaneously. Our high pressure
X-ray diffraction measurements reveal that, at around the critical pressure the
lattice of the TaIrTe4 sample is distorted by the application of pressure and
its volume is reduced by ~19.2%, the value of which is predicted to result in
the change of the electronic structure significantly. We propose that the
pressure-induced distortion in TaIrTe4 is responsible for the change of
topology of Fermi surface and such a change favors the emergence of
superconductivity. Our results clearly demonstrate the correlation among the
lattice distortion, topological physics and superconductivity in the WSM.
