Scale dependent superconductor–insulator transition

✍ Scribed by D. Kowal; Z. Ovadyahu

• Book ID: 104083548
• Publisher: Elsevier Science
• Year: 2008
• Tongue: English
• Weight: 198 KB
• Volume: 468
• Category: Article
• ISSN: 0921-4534
• DOI: 10.1016/j.physc.2007.07.012

✦ Synopsis

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 h depends systematically on sample geometry; superconductivity disappears when R h exceeds %6 kX in large samples. On the other hand, wide and sufficiently short samples of the same batch exhibit superconductivity (judged by conductivity vs. temperature) up to R h which is considerably larger. These results support the inhomogeneous scenario for the superconductor-insulator transition.