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Superconducting phase transitions in disordered NbTiN films
- Source :
- Scientific Reports, Vol 10, Iss 1, Pp 1-7 (2020), Scientific Reports
- Publication Year :
- 2020
- Publisher :
- Springer Science and Business Media LLC, 2020.
-
Abstract
- The suppression of superconductivity in disordered systems is a fundamental problem of condensed matter physics. Here we investigate the superconducting niobium-titanium-nitride (Nb_{1-x}Ti_{x}N) thin films grown by atomic layer deposition (ALD) where disorder is controlled by the slight tuning of the ALD process parameters. We observe the smooth crossover from the disorder-driven superconductor-normal metal transition (often reffered to as fermionic mechanism) to the case where bosonic mechanism dominates and increasing disorder leads to formation of metal with Cooper pairing. We show that, in moderately disordered films, the transition to zero-resistance state occurs in a full agreement with the conventional theories of superconducting fluctuations and Berezinskii-Kosterlitz-Thouless transition. However, the critically disordered films violate this accord showing low-temperature features possibly indicating the Bose metal phase. We show that it is the interrelation between film's sheet resistance in the maximum, R_{max}, of the resistive curve R(T) and R_q = h/4e^2 that distinguishes between these two behaviors. We reveal the characteristic features in magnetoresistance of the critically disordered films with R_{max} > R_q<br />8 pages, 3 figures
- Subjects :
- Phase transition
Materials science
FOS: Physical sciences
lcsh:Medicine
02 engineering and technology
01 natural sciences
Article
Superconducting properties and materials
Superconductivity (cond-mat.supr-con)
Metal
Condensed Matter::Materials Science
Atomic layer deposition
Surfaces, interfaces and thin films
Condensed Matter::Superconductivity
0103 physical sciences
Thin film
lcsh:Science
010306 general physics
Saturation (magnetic)
Sheet resistance
Condensed Matter::Quantum Gases
Superconductivity
Multidisciplinary
Condensed matter physics
Condensed Matter - Superconductivity
Drop (liquid)
lcsh:R
021001 nanoscience & nanotechnology
visual_art
visual_art.visual_art_medium
lcsh:Q
0210 nano-technology
Subjects
Details
- ISSN :
- 20452322
- Volume :
- 10
- Database :
- OpenAIRE
- Journal :
- Scientific Reports
- Accession number :
- edsair.doi.dedup.....4a1bf714613605d3ce2947ae1d4065db