Digi Notes ELECTRICAL CONDUCTIVITY IN MATERIALS PDF Download

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ELECTRICAL CONDUCTIVITY IN MATERIALS
DRUDE-LORENTZ THEORY OF FREE ELECTRON
ASSUMPTIONS OF CLASSICAL FREE ELECTRON THEORY
MEAN FREE PATH
MEAN COLLISION TIME
RELATION BETWEEN λ AND τ
RELAXATION TIME
DRIFT VELOCITY
EXPRESSION FOR ELECTRICAL CONDUCTIVITY AS PER CLASSICAL
FAILURES OF CLASSICAL FREE ELECTRON THEORY.
ASSUMPTIONS MADE IN QUANTUM FREE ELECTRON THEORY.
DENSITY OF STATES
FERMI ENERGY
FERMI FACTOR AND DEPENDANCE OF FERMI FACTOR ON
TEMPERATURE AND ENERGY
(PROBABILITY OF OCCUPATION OF VARIOUS ENERGY STATES BY ELCTRONS AT T=0K AND T>0K, ON THE BASIS OF FERMI FACTOR)
EXPRESSION FOR ELECTRICAL CONDUCTIVITY AS PER QUANTUM
FREE ELECTRON THEORY
MERITS OF QUANTUM FREE ELECTRON THEORY
(SUCCESS OF QUANTUM FREE ELECTRON THEORY IN OVERCOMING THE FAILURES OF CLASSICAL FREE ELECTRON THEORY)
SUPERCONDUCTORS
TEMPERATURE DEPENDENCE OF RESISTIVITY OF A METAL.
TEMPERATURE DEPENDENCE OF RESISTIVITY OF A SUPERCONDUCTOR:
BCS THEORY
MEISSNER EFFECT.
CRITICAL FIELD
TYPES OF SUPERCONDUCTORS
SEMICONDUCTORS

Describe Type I and Type II superconductors
Explain the terms a) relaxation time, b) mean collision time, c) mean free path, and drift velocity
Discuss in brief BCS theory of superconductivity
Write a note on maglev vehicles
Describe how quantum free electron theory has been successful in overcoming the failure of classical free electron theory.
Define Fermi energy and Fermi factor. Discuss the variation of Fermi factor with temperature and energy