HIGH DIELECTRIC CONSTANT AND VARIABLE RANGE HOPPING IN BI2SR2YCU2OY

摘要

The sample Bi2Sr2YCu2Oy prepared by solid state reaction method showed a single phase Bi-2212. DC resistivity measured in the temperature range 77.5-300 K showed M-I like transition. AC conductivity measurements were performed in the temperature range 80-473 K at different frequencies. The conduction is by Mott's Variable Range Hopping. Various parameters pertaining to the conduction process are evaluated. The value of dielectric constant epsilon increases with temperature and shows a very high value. For a given temperature the value is found to decrease with increase in frequency. [References: 44]