Solid State Physics

absorption coefficient adiabatic adiabatic demagnetization amplitude angle of incidence approximation atomic heat band beam boundary calculated charge component considered corresponding cosh crystal curves demagnetization density derived dielectric constant diffraction direction discussed dispersion relations dispersion surface effect electron electron-phonon energy current energy flow equation Ewald expansion coefficient expression factor Fermi surface formula Fourier free-electron frequency given by Eq gives hyperbola integral interaction local field longitudinal magnetic field matrix element measurements medium melting metals negative normal obtained optical oscillator parallel perpendicular phase phonon Phys plane wave polarization potential premelting radiation range reciprocal lattice reciprocal-lattice points reflection coefficient resonance result rocksalt rotating frame rſ field scattering Section semiequilibrium slice solid spin system spin temperature spin-lattice relaxation theory thermal equilibrium thickness tion transition transmission wave field wave function wave points wave trains wave vector wavelength zero