Solid State Physics

absorption according alkali halides antiferromagnetic approximation assume atoms Brillouin zone calculated cm² cm³ coefficient conduction band consider corresponding cubic Curie Curie temperature curve Debye density dielectric constant diffraction diffusion dipole direction discussed displacement divalent domain donor electric field emission entropy equal equation equilibrium example excited exciton experimental expression external field F centers Fermi level ferroelectric ferromagnetic free electron frequency germanium given holes impurities indicated interaction interstitial ionic crystals ions lattice vibrations luminescence magnetic field magnetic moment metals molecule momentum N. F. Mott NaCl negative ion vacancy number of electrons observed obtained paramagnetic particles photon Phys physical plane positive ion vacancy potential energy refer region relaxation represented resonance result scattering secondaries semiconductor solid specific heat spin spontaneous polarization structure surface theory thermal transition unit cell unit volume valence band velocity wave functions wave vector X-ray zero