The in plane normal state resistivity of a variety of underdoped cuprates is analysed in terms of a percolation model where carriers tunnel between metallic islands distributed in an insulating background. Exponential laws of the form r=roexp(To/T)a where the exponent a changes from1/4 at low temperature to ½ at higher temperatures are found to fit accurately the experimental data. The results are shown to be consistent with superconducting islands of size <100A and high Tc of order 100K, together with larger islands in the normal state embedded in an insulating matrix.
Effect of inhomogeneity on the transport in underdoped superconductors
DALLACASA, Valerio
2006-01-01
Abstract
The in plane normal state resistivity of a variety of underdoped cuprates is analysed in terms of a percolation model where carriers tunnel between metallic islands distributed in an insulating background. Exponential laws of the form r=roexp(To/T)a where the exponent a changes from1/4 at low temperature to ½ at higher temperatures are found to fit accurately the experimental data. The results are shown to be consistent with superconducting islands of size <100A and high Tc of order 100K, together with larger islands in the normal state embedded in an insulating matrix.
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