An increase in Tc under hydrostatic pressure in the superconducting doped topological insulator Nb0.25Bi2Se3

•Pressure increases the superconducting Tc in Nb0.25Bi2Se3.•This is contrary to behavior in SrxBi2Se3 where pressure suppresses Tc.•This points to a unique electronic state in NbxBi2Se3. We report a positive hydrostatic pressure derivative of the superconducting transition temperature in the doped topological insulator Nb0.25Bi2Se3 via dc SQUID magnetometry in pressures up to 0.6 GPa. This result is contrary to reports on the homologues CuxBi2Se3 and SrxBi2Se3 where smooth suppression of Tc is observed. This difference may be attributable to an electronic structure composed of multiple bands whereas the other materials in the superconducting doped Bi2Se3 family are believed to be single-band.