TY - JOUR
T1 - Scale dependent superconductor-insulator transition
AU - Kowal, D.
AU - Ovadyahu, Z.
PY - 2008/2/15
Y1 - 2008/2/15
N2 - 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□ depends systematically on sample geometry; superconductivity disappears when R□ exceeds ≈6 kΩ 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□ which is considerably larger. These results support the inhomogeneous scenario for the superconductor-insulator transition.
AB - 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□ depends systematically on sample geometry; superconductivity disappears when R□ exceeds ≈6 kΩ 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□ which is considerably larger. These results support the inhomogeneous scenario for the superconductor-insulator transition.
KW - Inhomogeneous media
KW - Long-range potential-fluctuations
KW - Superconductor-insulator transition
UR - http://www.scopus.com/inward/record.url?scp=39649116653&partnerID=8YFLogxK
U2 - 10.1016/j.physc.2007.07.012
DO - 10.1016/j.physc.2007.07.012
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AN - SCOPUS:39649116653
SN - 0921-4534
VL - 468
SP - 322
EP - 325
JO - Physica C: Superconductivity and its Applications
JF - Physica C: Superconductivity and its Applications
IS - 4
ER -