Thermal Variation of Different Components of Specific Heat for ErCl3

This paper reports the thermal variation of different specific heat components and entropy of ErCl3. The lattice component was calculated by adopting the empirical formula given by Chirico and Westrum (1980). The Schottky component was calculated between 10K and 300K using the crystal field energy levels . The hyperfine splitting of 167Er in ErCl3 was found to be ~ 1240×10-4 cm-1 and with these split energy levels the hyperfine specific heat was calculated . Two peaks were observed in its thermal variation . These peaks are 0.765R and 0.567R at about 1.2mK and 54.5mK respectively.