Superconductivity above 200K Observed in Superhydrides of Calcium.

The calcium superhydrides are synthesized at high pressure of 160 GPa & high temperature. Superconductivity with Tc onset about 210 K is realized in thus obtained hydrogen rich calcium compounds at high pressure. The critical magnetic field Hc(0) is estimated to be ~ 169 T in the Ginzburg Landau model.