Superconductivity and Shubnikov - de Haas effect in polycrystalline Cd3As2 thin films

Leonid N Oveshnikov; Alexander B Davydov; Alexey V Suslov; Alexey I Ril'; Sergey F Marenkin; Alexander L Vasiliev; Boris A Aronzon

doi:10.1038/s41598-020-61376-6

Superconductivity and Shubnikov - de Haas effect in polycrystalline Cd₃As₂ thin films

Sci Rep. 2020 Mar 12;10(1):4601. doi: 10.1038/s41598-020-61376-6.

Authors

Leonid N Oveshnikov^{1

2}, Alexander B Davydov³, Alexey V Suslov⁴, Alexey I Ril'⁵, Sergey F Marenkin^{5

6}, Alexander L Vasiliev^{7

8}, Boris A Aronzon³

Affiliations

¹ National Research Center "Kurchatov Institute", Moscow, 123182, Russia. oveshln@gmail.com.
² P. N. Lebedev Physical Institute, Russian Academy of Sciences, Moscow, 119991, Russia. oveshln@gmail.com.
³ P. N. Lebedev Physical Institute, Russian Academy of Sciences, Moscow, 119991, Russia.
⁴ National High Magnetic Field Laboratory, Tallahassee, Florida, 32310, USA.
⁵ Kurnakov Institute of General and Inorganic Chemistry, Russian Academy of Sciences, Moscow, 119991, Russia.
⁶ National University of Science and Technology "MISiS", Moscow, 119049, Russia.
⁷ National Research Center "Kurchatov Institute", Moscow, 123182, Russia.
⁸ Moscow Institute of Physics and Technology, Dolgoprudny, Moscow region, 141700, Russia.

Abstract

In this study we observed the reproducible superconducting state in Cd₃As₂ thin films without any external stimuli. Comparison with our previous results reveals similar qualitative behavior for films synthesized by different methods, while the difference in the values of the critical parameters clearly shows the possibility to control this state. The X-ray diffraction measurements demonstrate the presence of the tetragonal Cd₃As₂ crystal phase in studied films. Measurements of high-field magnetoresistance reveal pronounced Shubnikov - de Haas oscillations. The analysis of these oscillations suggests that, due to high carrier concentration in studied Cd₃As₂ films, the initial Dirac semimetal phase may be partially suppressed, which, however, does not contradict with possible topological nature of the observed superconductivity.