Abstract
Low-temperature neutron diffraction measurements were performed on single crystals of Rb2Cr1-xMnxCl4 (0<or=x<or=1). From these experiments a concentration versus temperature magnetic phase diagram is obtained. Three concentration ranges with different magnetic behaviour are found. In the same range as the Jahn-Teller-induced superstructure occurs, 0<or=x<or=0.41, a somewhat canted ferromagnetic structure exists. An antiferromagnetic order is found in the range 0.59<or=x<or=1. The T versus x dependence of the phase boundaries and the magnitudes of the magnetic moments are discussed with respect to percolation behaviour. Within the percolation limits xF=0.41 for ferromagnetic and xAF=0.59 for antiferromagnetic ordering no magnetic long-range order is observed. This finding is consistent with a proposed spin glass phase for intermediate concentrations.
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