High-Temperature Superconducting Phase in Clathrate Calcium Hydride CaH$_6$ up to 215 K at a Pressure of 172 GPa

The recent discovery of superconductive rare earth and actinide superhydrides has ushered in a new era of superconductivity research at high pressures. This distinct type of clathrate metal hydrides was first proposed for alkaline-earth-metal hydride CaH$_6$ that, however, has long eluded experiment... View More