Superconductivity in Thin Films of the Dirac Semimetal Cd3As2

Давыдов, А. Б.; Oveshnikov, L. N.; Суслов, А. В.; Ril, A. I.; Маренкин, С. Ф.; Аронзон, Б. А.

doi:10.1134/s1063783420030063

Cited by 5 publications

(2 citation statements)

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“…Thus, Cd 3 As 2 is currently being explored for technological applications based on the topological properties, e.g., for optical switches, electronic devices operating at frequencies in the terahertz regime, and high-sensitivity photodetectors [13][14][15]. In addition, Cd 3 As 2 is a prime candidate for applications based on the large magnetoresistance, room-temperature chiral charge pumping, thermoelectric properties, and possible topological superconductivity [16][17][18][19][20]. Assessing the stability of the ambient-condition phase of Cd 3 As 2 and understanding * sven.friedemann@bristol.ac.uk conditions from which this phase can be recovered with ultrahigh carrier mobilities after applying strain is of paramount importance for the development of devices based on this topological semimetal.…”

Section: Introductionmentioning

confidence: 99%

Pressure-induced reconstructive phase transition inCd3As2

Gamża

Abrami

Gammond

et al. 2021

Phys. Rev. Materials

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Cadmium arsenide (Cd 3 As 2) hosts massless Dirac electrons in its ambient-condition 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 nonreversible electronic properties, including self-doping associated with defects and a reduction of the electron mobility by an order of magnitude due to increased scattering. This paper 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 • 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 Å, b HP ≈ 17.15 Å, and c HP ≈ 18.58 Å. The diffraction study indicates that, during the structural transformation, a new phase with another primitive orthorhombic structure may also be stabilized by deviatoric stress, providing an additional venue for tuning the unconventional electronic states in Cd 3 As 2 .

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Section: Introductionmentioning

confidence: 99%

Pressure-induced reconstructive phase transition inCd3As2

Gamża

Abrami

Gammond

et al. 2021

Phys. Rev. Materials

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show abstract

“…Thus, Cd 3 As 2 is a prime candidate for technological applications based on topological properties, e.g. for optical switches, thermoelectrics, or based on the large magnetoresistance and possible topological superconductivity [12][13][14][15][16]. Understanding the stability and formation of the ambient-conditions phase of Cd 3 As 2 is important for fundamental research and applications, e.g.…”

Section: Introductionmentioning

confidence: 99%

Pressure-induced reconstructive phase transition in Cd$_3$As$_2$

Gamża,

Abrami,

Gammond

et al. 2020

Preprint

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Cadmium arsenide Cd3As2 hosts massless Dirac electrons in its ambient-conditions tetragonal phase. We report X-ray diffraction and electrical resistivity measurements of Cd3As2 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 °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 aHP ≈ 8.68 Å, bHP ≈ 17.15 Å and cHP ≈ 18.58 Å. 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.

show abstract