  Superconductivity (SC) was experimentally observed for the first time in
antimony polyhydride. The diamond anvil cell combined with laser heating system
was used to synthesize the antimony polyhydride sample at high pressure and
high temperature conditions. In-situ high pressure transport measurements as
function of temperature with applied magnet are performed to study the SC
properties. It was found that the antimony polyhydride samples show
superconducting transition with critical temperature $T_c = 116^\circ$K at 184
GPa. The investigation of SC at magnetic field revealed that the
superconducting coherent length ~40 angstroms based on Ginzburg Landau (GL)
equation. Antimony polyhydride superconductor has the second highest Tc in
addition to sulfur hydride among the polyhydrides of elements from main group
IIIA to VIIA in periodic table.
