Back to Search
Start Over
The paraconductivity of granular Al-films at high reduced temperatures and magnetic fields
- Source :
- Physical Review B, Physical Review B, American Physical Society, 2019, 100 (10), pp.104509. ⟨10.1103/PhysRevB.100.104509⟩
- Publication Year :
- 2019
- Publisher :
- arXiv, 2019.
-
Abstract
- The electrical conductivity induced near the superconducting transition by thermal fluctuations was measured in different granular aluminum films. The seemingly anomalous behavior at high reduced temperatures and magnetic fields is explained by taking into account a total-energy cutoff in the superconducting fluctuation spectrum in both the direct (Aslamazov-Larkin) and the indirect (anomalous Maki-Thompson) contributions to the fluctuation effects. The analysis allowed a reliable determination of the coherence length amplitudes, which resulted to be much larger (20-48 nm) than the grains size (5-10 nm). This suggests that the grains are strongly Josephson-coupled, while the Tc value is still as high as twice the bulk value. These results could contribute to identify the mechanisms enhancing Tc in these materials.<br />Comment: 9 pages, 8 figures
- Subjects :
- Superconductivity
Materials science
Condensed matter physics
Condensed Matter - Superconductivity
chemistry.chemical_element
Thermal fluctuations
FOS: Physical sciences
02 engineering and technology
021001 nanoscience & nanotechnology
01 natural sciences
Coherence length
Magnetic field
Superconductivity (cond-mat.supr-con)
Amplitude
chemistry
Aluminium
Electrical resistivity and conductivity
Condensed Matter::Superconductivity
0103 physical sciences
[PHYS.COND.CM-DS-NN]Physics [physics]/Condensed Matter [cond-mat]/Disordered Systems and Neural Networks [cond-mat.dis-nn]
010306 general physics
0210 nano-technology
Fluctuation spectrum
Subjects
Details
- ISSN :
- 24699950 and 24699969
- Database :
- OpenAIRE
- Journal :
- Physical Review B, Physical Review B, American Physical Society, 2019, 100 (10), pp.104509. ⟨10.1103/PhysRevB.100.104509⟩
- Accession number :
- edsair.doi.dedup.....1b1a801d316fb96ca35b6c016e3dea7f
- Full Text :
- https://doi.org/10.48550/arxiv.1909.04194