AU: 4.0
Programme: PHY(SPS)

This course discusses the electronic and magnetic properties of solids. Metals - conductivity and heat capacity; density of states at Fermi level; nearly free electron model and band gaps. Distinction between metals, semiconductors and insulators. Semiconductors - direct and indirect band gap (Si, Ge, GeAs); optical absorption, effective mass and holes; carrier concentration, law of mass action; impurity donors and acceptors; mobility and Hall effect; band gap measurements. Magnetic susceptibility, Larmor diamagnetism, paramagnetism and Curie?s law; Pauli paramagnetism; magnetic ordering (ferromagnetism and anti-ferromagnetism) and Weiss molecular field theory; Curie-Weiss susceptibility.