Enhanced Fluctuation/Inhomogeneity Effects Near The Superconductor-Insulator Transition in Severely Underdoped 2D Films of Ca0.3Y0.7Ba2Cu3O7-δ
Abstract
It has been shown that the superconductor-insulator transition in two-dimensional, severely underdoped films of Ca-doped YBCO is accompanied by a linear scaling between the zero temperature superfluid density ns (T = 0) and the temperature for the unbinding of thermally excited vortex pairs, T2 D. We present results from resistivity and magnetic screening studies on 2D Ca-YBCO showing a linear relationship between the width of tails in the resistive transition and T2 D. These tails show a significant suppression of resistivity and can extend down for tens of Kelvins before the films exhibit magnetic screening. We examine this relationship in light of a possible enhancement of inhomogeneous effects in the vicinity of the superconductor-insulator transition with underdoping.
Supported by DOE Grant FG02-08ER46533.- Publication:
-
APS March Meeting Abstracts
- Pub Date:
- March 2015
- Bibcode:
- 2015APS..MARD11006S