Breakdown of three-dimensional Dirac semimetal state in pressurized C d3A s2
Abstract
We report an observation of a pressure-induced breakdown of the three-dimensional Dirac semimetal (3D-DSM) state in C d3A s2 , evidenced by a series of in situ high-pressure synchrotron x-ray diffraction and single-crystal transport measurements. We find that C d3A s2 undergoes a structural phase transition from a metallic tetragonal phase in space group I 41/a c d to a semiconducting monoclinic phase in space group P 21/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 C d3A s2 .
- Publication:
-
Physical Review B
- Pub Date:
- April 2015
- DOI:
- 10.1103/PhysRevB.91.165133
- arXiv:
- arXiv:1410.3213
- Bibcode:
- 2015PhRvB..91p5133Z
- Keywords:
-
- 71.55.Ak;
- 74.62.Fj;
- 71.30.+h;
- Metals semimetals and alloys;
- Pressure effects;
- Metal-insulator transitions and other electronic transitions;
- Condensed Matter - Superconductivity;
- Condensed Matter - Materials Science
- E-Print:
- 17 pages, 4 figures