Digi Notes ELECTRICAL CONDUCTIVITY IN MATERIALS PDF Download

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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

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

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