Pressure-induced reconstructive phase transition in Cd3As2
| Autor: | Sven Friedemann, Sitikantha D. Das, Takaki Muramatsu, Jake Ayres, Paolo Abrami, Israel Osmond, Dominik Daisenberger, Lawrence V. D. Gammond, Monika Gamza, Robert Armstrong, Hugh Perryman |
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| Rok vydání: | 2021 |
| Předmět: |
Phase transition
Materials science Physics and Astronomy (miscellaneous) F321 Lattice (group) FOS: Physical sciences Cadmium arsenide 02 engineering and technology 01 natural sciences Condensed Matter - Strongly Correlated Electrons Condensed Matter::Materials Science chemistry.chemical_compound Tetragonal crystal system Phase (matter) 0103 physical sciences General Materials Science 010306 general physics Condensed Matter - Materials Science Strongly Correlated Electrons (cond-mat.str-el) Scattering Materials Science (cond-mat.mtrl-sci) 021001 nanoscience & nanotechnology Crystallography Chemical bond chemistry Orthorhombic crystal system 0210 nano-technology |
| Zdroj: | Gamża, M, Abrami, P, Gammond, L V D, Ayres, J, Osmond, I, Muramatsu, T, Armstrong, R, Perryman, H, Daisenberger, D, Das, S & Friedemann, S 2021, ' Pressure-induced reconstructive phase transition in Cd 3 As 2 ', Physical Review Materials, vol. 5, no. 2, 024209 . https://doi.org/10.1103/PhysRevMaterials.5.024209 Physical Review Materials Gamza, M, Abrami, P, Gammond, L V D, Ayres, J, Osmond, I, Muramatsu, T, Armstrong, R, Perryman, H, Daisenberger, D, Das, S & Friedemann, S 2021, ' Pressure-induced reconstructive phase transition in Cd3As2 ', Physical Review Materials, vol. 5, no. 2, 024209 . https://doi.org/10.1103/PhysRevMaterials.5.024209 |
| ISSN: | 2475-9953 |
| Popis: | Cadmium arsenide Cd$_3$As$_2$ hosts massless Dirac electrons in its ambient-conditions tetragonal phase. We report X-ray diffraction and electrical resistivity measurements of Cd$_3$As$_2$ upon cycling pressure beyond the critical pressure of the tetragonal phase and back to ambient conditions. We find that at room temperature the transition between the low- and high-pressure phases results in large microstrain and reduced crystallite size both on rising and falling pressure. This leads to non-reversible electronic properties including self-doping associated with defects and a reduction of the electron mobility by an order of magnitude due to increased scattering. Our study indicates that the structural transformation is sluggish and shows a sizable hysteresis of over 1~GPa. Therefore, we conclude that the transition is first-order reconstructive, with chemical bonds being broken and rearranged in the high-pressure phase. Using the diffraction measurements we demonstrate that annealing at ~200$^\circ$C greatly improves the crystallinity of the high-pressure phase. We show that its Bragg peaks can be indexed as a primitive orthorhombic lattice with a_HP~8.68 A b_HP~17.15 A and c_HP~18.58 A. The diffraction study indicates that during the structural transformation a new phase with another primitive orthorhombic structure may be also stabilized by deviatoric stress, providing an additional venue for tuning the unconventional electronic states in Cd3As2. 12 pages with 7 figures |
| Databáze: | OpenAIRE |
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