Observation of subkelvin superconductivity in Cd3As2 thin films
| Autor: | A. B. Davydov, B. A. Aronzon, K. I. Kugel, V. M. Pudalov, L. A. Morgun, E. A. Pilyuk, V S Zakhvalinskii, Alexey Suslov, A. P. Kuzmenko, A. V. Kochura, L. N. Oveshnikov |
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| Rok vydání: | 2019 |
| Předmět: |
Superconductivity
Materials science Lattice (group) 02 engineering and technology 021001 nanoscience & nanotechnology 01 natural sciences Homogeneous distribution Crystal Condensed Matter::Materials Science Crystallography symbols.namesake Electrical resistivity and conductivity Condensed Matter::Superconductivity 0103 physical sciences symbols Crystallite 010306 general physics 0210 nano-technology Raman spectroscopy Stoichiometry |
| Zdroj: | Physical Review B. 99 |
| ISSN: | 2469-9969 2469-9950 |
| Popis: | We report an experimental observation of superconductivity in ${\mathrm{Cd}}_{3}{\mathrm{As}}_{2}$ thin films without application of external pressure. The films under study were synthesized by magnetron sputtering. Surface studies suggest that the observed transport characteristics are related to the polycrystalline continuous part of the investigated films with a homogeneous distribution of elements and the Cd-to-As ratio close to stoichiometric ${\mathrm{Cd}}_{3}{\mathrm{As}}_{2}$. The latter is also supported by Raman spectra of the studied films where two pronounced peaks inherent to ${\mathrm{Cd}}_{3}{\mathrm{As}}_{2}$ were observed. The obtained x-ray diffraction patterns for studied films also correspond to the ${\mathrm{Cd}}_{3}{\mathrm{As}}_{2}$ lattice. The formation of a superconducting phase in the films under study is confirmed by the characteristic behavior of the temperature and the magnetic field dependence of the sample resistivity, as well as by the presence of pronounced zero-resistance plateaus in the $dV/dI$ characteristics. The corresponding ${H}_{c}\text{\ensuremath{-}}{T}_{c}$ plots reveal a clearly pronounced linear behavior within the intermediate temperature range, similar to that observed for bulk ${\mathrm{Cd}}_{3}{\mathrm{As}}_{2}$ and ${\mathrm{Bi}}_{2}{\mathrm{Se}}_{3}$ films under pressure, suggesting the possibility of a nontrivial pairing in the films under investigation. We discuss a possible role of the sample inhomogeneities and crystal strains in the observed phenomena. |
| Databáze: | OpenAIRE |
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