Critical or Transitional Temperature

1690 WordsFeb 21, 20187 Pages
BASIC CONCEPT Critical temperature: The temperature at which the resistance of a material suddenly drops to zero is termed as critical or transition temperature. Superconductors: The phenomenon of disappearance of electrical resistance below a certain temperature is termed as superconductivity and the material in this state is termed as superconductor. The resistance of a metal decreases with decrease in temperature and reaches a certain minimum value but the process of cooling down a material in order to convert into a superconductor is very costly and hence a lot of research was undertaken for this purpose. They have zero resistance and perfect diamagnetism. https://encrypted-tbn0.gstatic.com/images?q=tbn:ANd9GcTqUWD_mZmMFri_68IDz0XPxJunW7iX8uje1M3cmbVvdPtyCKl6wA Meissner effect: When a superconductor is cooled below critical temperature in an external magnetic field then the lines of induction at transition are pushed out of the material and this phenomenon is termed as Meissner effect. Application of strong magnetic fled results in breakdown of the superconductor and loses its superconducting properties. Based on the breakdown superconductors are of two types, they are: • Type 1: Superconductivity is destroyed with the application of magnetic field greater than a certain value, Hc1. . • Type 2: Superconductivity of the material reaches a mixed state with the application of magnetic field greater than a certain value, Hc1. where the magnetic field can penetrate the
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