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Abstract
The magnetic susceptibility of the tetragonal semimagnetic semiconductor (Cd 1− x−y Zn y Mn x ) 3As 2 (CZMA) with various compositions has been measured in the temperature range 4.2–300 K. The paramagnetic part of the measured susceptibility is analysed within our generalized pair approximation (GPA) and treating the total Mn-Mn interaction strength as a sum of superexchange and the Bloembergen-Rowland exchange. As a result, the values of the first nearest-neighbour exchange constants for both mechanisms are determined appearing to be strongly dependent on Zn content. Finally, the results of our susceptibility measurements of CZMA, extended in some cases up to 370 K, are compared with those obtained recently by other authors for (Zn 1− x Mn x ) 3As 2 (ZMA) and (Cd 1− x Mn x ) 3As 2 (CMA) and a possible origin of the observed differences is discussed.
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