Calculations of the Specific Heat and the Magnetic Susceptibility of Ferric Ammonium Alum at Very Low Temperatures

Abstract

The specific heat and the magnetic susceptibility of ferric ammonium alum at very low temperatures are investigated theoretically. The calculated results are in good agreement with the recent specific heat measurement by Vilches and Wheatley with use of appropriate crystalline field parameters for this salt. The results are also compared with the magnetic susceptibility data with a satisfactory agreement.