Growth of Thin Cadmium Arsenide Films by Magnetron Sputtering and Their Structure

Kochura, A. V.; Захвалинский, В. С.; Htet, None Aung Zaw; Ril, A. I.; Pilyuk, E. A.; Kuzmenko, A. P.; Аронзон, Б. А.; Маренкин, С. Ф.

doi:10.1134/s002016851909005x

Cited by 10 publications

(6 citation statements)

References 31 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…1(a)) exhibits prominent features represented by isolated 100-200 nm-sized equiaxed grains, which appear in bright contrast in the AFM image while scanning the film surface. The peculiar surface morphology was reported earlier for the magnetron-sputtered Cd 3 As 2 films, where it was also attested that this granular structure was not affected by annealing [5,6]. The recorded AFM image (Fig.…”

Section: Methodssupporting

confidence: 82%

“…The composition of the grown films was nearly stoichiometric, as it was verified by energy dispersive X-ray analysis, demonstrating that the actual elemental composition is close to the stoichiometric Cd 3 As 2 within 2% accuracy [6]. The phase composition of the grown Cd 3 As 2 films was characterized by X-ray diffraction analysis (XRD) at room temperature [5]. The XRD data for the polycrystalline Cd 3 As 2 films synthesized by magnetron sputtering [6] indicate the presence of both α (space group I4 1 /acdm, a=12.6461 Å, c=25.4378 Å) and α ′ (space group P 4 2 /nbc, a=12.6848, c=25.4887 Å) phases.…”

Section: Methodsmentioning

confidence: 65%

“…Thin Cd 3 As 2 films investigated in the present study were grown by non-reactive rf magnetron sputtering in an argon atmosphere on polished oriented single-crystalline (100)p-Si and (001) α-Al 2 O 3 wafers (for more detail, see Ref. [5]). Since the (0001) α-Al 2 O 3 and (224) α-Cd 3 As 2 have the similar structure and their interatomic (interstitial) distances differ by only 6%, the oriented film growth can be promoted.…”

Section: Methodsmentioning

confidence: 99%

“…However, the accomplishment of topological SC is still under intense debate, since it is necessary to exclude various effects related to the possible symmetry lowering due to crystal deformation accompanying structural transitions under the applied pressure [4]. In the recent study, SC was discovered in the magnetron sputtered Cd 3 As 2 polycrystalline films [5], which revealed several features, such as the presence of tetragonal crystalline phase and Shubnikov -de Haas oscillations observed in high magnetic fields, indicating its possible topological nature [6].…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Morphology and Optical Properties of Thin Cd3As2 Films of a Dirac Semimetal Compound

Kovaleva,

Fekete,

Chvostova

et al. 2023

Preprint

View full text Add to dashboard Cite

Using atomic-force microscopy (AFM) and wide-band (0.02-8.5 eV) spectroscopic ellipsometry techniques we investigated morphology and optical properties of Cd 3 As 2 films grown by nonreactive rf magnetron sputtering on two types of oriented crystalline substrates (100)p-Si and (001) α-Al 2 O 3 . The AFM study revealed grainy morphology of the films due to island incorporation during the film growth. The complex dielectric function spectra of the annealed Cd 3 As 2 /Al 2 O 3 films manifest pronounced interband optical transitions at 1.2 and 3.0 eV, in excellent agreement with the theoretical calculations for the body centered tetragonal Cd 3 As 2 crystal structure. We discovered that due to electronic excitations to the Cd(s) conical bands the low-energy absorption edge of the annealed Cd 3 As 2 films reveals linear dependence. We found that for the annealed Cd 3 As 2 films the Cd(s) conical node may be shifted in energy by about 0.08-0.18 eV above the heavy-flat As(p) valence band, determining the optical gap value. The as-grown Cd 3 As 2 films exhibit the pronounced changes of the electronic band structure due to doping effect associated with Cd non-stoichiometry, where fine-tuning of Cd concentration may result in the gapless electronic band structure of Dirac semimetals.

show abstract

Section: Methodssupporting

confidence: 82%

Section: Methodsmentioning

confidence: 65%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Morphology and Optical Properties of Thin Cd3As2 Films of a Dirac Semimetal Compound

Kovaleva,

Fekete,

Chvostova

et al. 2023

Preprint

View full text Add to dashboard Cite

show abstract

“…Finally, we would like to note that it will be challenging to investigate the dc transport and superconductivity properties of the ultrathin Bi films possessing 2D TI surface states following the approach presented in [29], where the subkelvin superconductivity without any external stimuli was discovered in 3D TI Cd 3 As 2 films [30,31].…”

Section: Discussionmentioning

confidence: 99%

Bi Layer Properties in the Bi–FeNi GMR-Type Structures Probed by Spectroscopic Ellipsometry

et al. 2022

View full text Add to dashboard Cite

Bismuth (Bi) having a large atomic number is characterized by a strong spin–orbit coupling (SOC) and is a parent compound of many 3D topological insulators (TIs). The ultrathin Bi films are supposed to be 2D TIs possessing a nontrivial topology, which opens the possibility of developing new efficient technologies in the field of spintronics. Here we aimed at studying the dielectric function properties of ultrathin Bi/FeNi periodic structures using spectroscopic ellipsometry. The [Bi(d)–FeNi(1.8 nm)]N GMR-type structures were grown by rf sputtering deposition on Sitall-glass (TiO2) substrates. The ellipsometric angles Ψ(ω) and Δ(ω) were measured for the grown series (d = 0.6, 1.4, 2.0, and 2.5 nm, N = 16) of the multilayered film samples at room temperature for four angles of incidence of 60∘, 65∘, 70∘, and 75∘ in a wide photon energy range of 0.5–6.5 eV. The measured ellipsometric angles, Ψ(ω) and Δ(ω), were simulated in the framework of the corresponding multilayer model. The complex (pseudo)dielectric function spectra of the Bi layer were extracted. The GMR effects relevant for the studied Bi–FeNi MLF systems were estimated from the optical conductivity zero-limit (optical GMR effect). The obtained results demonstrated that the Bi layer possessed the surface metallic conductivity induced by the SOC effects, which was strongly enhanced on vanishing the semimetallic-like phase contribution on decreasing the layer thickness, indicating its nontrivial 2D topology properties.

show abstract

AC conductivity of amorphous and polycrystalline Cd3As2 films on single crystal substrates of Al2O3

Morocho

Pilyuk

Захвалинский

et al. 2022

Physica B: Condensed Matter

View full text Add to dashboard Cite

Growth of Thin Cadmium Arsenide Films by Magnetron Sputtering and Their Structure

Cited by 10 publications

References 31 publications

Morphology and Optical Properties of Thin Cd3As2 Films of a Dirac Semimetal Compound

Morphology and Optical Properties of Thin Cd3As2 Films of a Dirac Semimetal Compound

Bi Layer Properties in the Bi–FeNi GMR-Type Structures Probed by Spectroscopic Ellipsometry

AC conductivity of amorphous and polycrystalline Cd3As2 films on single crystal substrates of Al2O3

Contact Info

Product

Resources

About