MAGNETIC SPECIFIC-HEAT OF (CD1-X-YZNYMNX)3AS2

The specific heat of (Cd1-x-yZnyMnx)3As2 with low Mn concentration (x less-than-or-equal-to 0.067) and for two Zn contents (y = 0.14 and y = 0.34) has been measured in the temperature range of 1.5-30 K. The mag netic contribution to the total specific heat has been analysed within our generalized pair approximation model which takes into account the complicated tetragonal crystal structure of Cd1-x-yZnyMnx)3As2. Assum ing that the total Mn-Mn interaction strength is a sum of superexchang e and the Bloembergen-Rowland exchange, we have obtained a very good a greement between our approach and experiment by using the analytical f ormulae with only two adjustable parameters, i.e. the first nearest-ne ighbour exchange constants for both mechanisms which appear to be stro ngly dependent on Zn content.