Abstract
Results of a systematic study of lattice parameters and resistivity on Bi 2Sr 2Ca 1− x Er x Cu 2O 8+δ, with value of x in the range 0.0 ⩽ x ⩽ 1.0 are reported. The quality of samples has been examined by XRD and resistivity measurements. The suppression of superconductivity is attributed to the effect of disorder. The resistivity behaviour in the insulating regime is analyzed in the hopping conduction approach. The nature of the density of states as determined using the Ortuno and Pollak model is found to be concave near E F. At the MIT, the localization length diverges and the metallicity vanishes following a scaling law with the critical exponent, μ = 1. The high value of differential activation energy suggests multiphonon assisted hopping at low temperatures.
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