Source [Internet]: http://www.diginotes.in/index.html
Topics covered:
- 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
QUESTION BANK
- 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
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