Here we present a systematic study of the effects of pressure on the superconducting and spin/charge density wave (SDW/CDW) transitions of Ba 1-xNaxTi2Sb2O (x = 0, 0.10, and 0.15) by means of resistivity measurements. For x = 0 and 0.10, external pressure results in a decease of the SDW/CDW transition temperature Tc; however, no measurable change is observed for the x = 0.15. The pressure effect on the superconducting transition temperature is different for all three samples. For BaTi2Sb2O (x = 0), Tc increases significantly from 1.2 K at zero pressure to ∼2.9 K at 16.1 kbar. The 10% Na-doped sample shows an initial Tc increase up to 4.2 K with pressure which saturates at higher pressure values. For higher Na concentrations (x = 0.15), Tc continuously decreases with increasing pressure.
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