Fig. 1: Structure information and transport properties for the 1048 superconductor.

a The crystal structure of the 1048 superconductor. b Ambient-pressure resistance as a function of temperature, displaying a superconducting transition with an extradentary sharp drop at 26 K. c–f Temperature dependence of resistance for the S#1 and S#2 surrounded by the pressure transmitting medium (PTM) of NaCl in the measurements. g, h Resistance versus temperature for the S#4 surrounded by the liquid PTM of glycerin in the measurements.