2007/08/21 by D. Kowal, Z. Ovadyahu · 2 citations
Chemistry · Physics and Astronomy · #Amorphous solid #Chemistry #Composite material #Condensed matter physics #Conductivity #Crystallography #Electrical resistivity and conductivity #Indium #Insulator (electricity) #Materials science #Metallurgy #Optoelectronics #Oxide #Physical chemistry #Physics #Physics of Superconductivity and Magnetism #Quantum and electron transport phenomena #Superconductivity #Theoretical and Computational Physics #Transition temperature #cond-mat.dis-nn #cond-mat.supr-con
paper · pdf · doi:10.1016/j.physc.2007.07.012
Contribution to the proceedings of "Fluctuations and phase transitions in superconductors", Nazareth Ilit, Israel, June 10-14, 2007
arxiv created 2007/08/21 · openalex publication_date 2007/12/05 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
We study the disorder driven superconductor to insulator transition in amorphous films of high carrier-concentration indium-oxide. Using thin films with various sizes and aspect ratios we show that the `critical' sheet-resistance R\small \square depends systematically on sample geometry; superconductivity disappears when R\small \square exceeds ≈6 kΩ in large samples. On the other hand, wide and sufficiently short samples of the same batch exhibit superconductivity (judged by conductivity versus temperature) up to R\small \square which is considerably larger. These results support the inhomogeneous scenario for the superconductor-insulator transition.