Investigation of Rb2MnxCr1-xCl4, a random mixture of a ferromagnet and of an antiferromagnet, by magnetic resonance in the millimetre wave range

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Abstract
The authors have investigated the mixed crystal system Rb2MnxCr1-xCl4 with competing exchange interactions and competing anisotropies over the whole concentration range x by means of magnetic resonance in the millimetre wave range. The measurements have been performed for several configurations of the external magnetic field. The analysis of their experimental data is based on calculations with a modified average or virtual crystal model. The results of their investigation confirm for high Mn2- (0.862+ concentrations (0<or=x<or=0.13) the antiferromagnetic and ferromagnetic order, respectively, as observed by neutron diffraction. The essentially new result of their study is that their experimental results and the model data based upon them also provide information about the intermediate-concentration range where the mixed crystals exhibit pronounced disorder phenomena and spin-glass behaviour.