ACTA

Magnetic Specific Heat of (Cd_{1-x-y}Zn_yMn_x)₃As₂}

H. Bednarski^a, J. Cisowski^a, D. Schmitt^b, J. Voiron^b, J.C. Portal^c and W. Lubczyński^a
^aDepartment of Solid State Physics, Polish Academy of Sciences, Wandy 3, 41-800 Zabrze, Poland
^bLaboratoire de Magnétisme Louis Néel, CNRS, Grenoble, France
^cService National des Champs Intenses, CNRS, Grenoble and Departement de Génie Physique, INSA, Toulouse, France

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The specific heat of (Cd_1-x-yZn_yMn_x)₃As₂ with low Mn concentration (x ≤ 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 magnetic 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 Cd_1-x-yZn_yMn_x)₃As₂. Assuming that the total Mn-Mn interaction strength is a sum of superexchange and the Bloembergen-Rowland exchange, we have obtained a very good agreement between our approach and experiment by using the analytical formulae with only two adjustable parameters, i.e. the first nearest-neighbour exchange constants for both mechanisms which appear to be strongly dependent on Zn content.

DOI: 10.12693/APhysPolA.84.705
PACS numbers: 75.40.-s, 75.30.Et