Physical Review · 1957 · 156 citations · 0 references
Natural SciencesMaterials SciencePhysicsCondensed Matter PhysicsSolid State PhysicsVibrationCritical PhenomenaCrystal LatticeLattice SymmetryMode ShapesPhase TransitionsVibrational StructureCritical Point BehaviorCritical PointsCritical PropertiesLattice VibrationsNondegenerate Critical Points