Abstract
We report an observation of a pressure-induced breakdown of the three-dimensional Dirac semimetal (3D-DSM) state in Cd3As2, evidenced by a series of in situ high-pressure synchrotron x-ray diffraction and single-crystal transport measurements. We find that Cd3As2 undergoes a structural phase transition from a metallic tetragonal phase in space group I41/acd to a semiconducting monoclinic phase in space group P21/c at critical pressure 2.57 GPa; above this pressure, an activation energy gap appears, accompanied by distinct switches in Hall resistivity slope and electron mobility. These changes of crystal symmetry and corresponding transport properties manifest the breakdown of the 3DDSM state in pressurized Cd3As2.Received 4 January 2015Revised 5 April 2015DOI:https://doi.org/10.1103/PhysRevB.91.165133©2015 American Physical Society
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