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We report the first observation of a pressure-induced breakdown of the 3D-DSMstate in Cd3As2, evidenced by a series of in-situ high-pressure synchrotronX-ray diffraction (XRD) and single crystal transport measurements. We find thatCd3As2 undergoes a structural phase transition from a metallic tetragonal (T)phase in space group I41/acd to a semiconducting monoclinic (M) phase in spacegroup P21/c at critical pressure 2.57 GPa, above this pressure, an activationenergy gap appears, accompanied by distinct switches in Hall resistivity slopeand electron mobility. These changes of crystal symmetry and correspondingtransport properties manifest the breakdown of the 3D-DSM state in pressurizedCd3As2.

Breakdown of Three-dimensional Dirac Semimetal State in pressurized Cd3As2