THERMODYNAMICS OF METAL-INSULATOR SYSTEMS - THE 2-FLUID MODEL IN THE PRESENCE OF A MAGNETIC-FIELD

The phenomenological two-fluid model involving localized and itinerant electrons has been successful in explaining zero-field thermodynamic measurements in disordered metal-insulator systems such as Si:P. We ha ve extended this model to include the effects of a magnetic field B, a nd have used the modified equations to account for recent specific hea t and susceptibility measurements made as a function of B. Predictions of the Wilson ratio behaviour at low temperatures in finite fields re main to be tested.