Abstract
The distorted K 2NiF 4-structure and the magnetic behaviour of the quasi two-dimensional magnetic system Rb 2Cr 1- x Mn x Cl 4 (0 ⪅ x ⪅ 0.5) are studied by neutron diffraction and magnetic measurements. Strong correlations between ferromagnetic coupling and cooperative Jahn—Teller order are indicated by their occurence in the same concentration range 0 ⩽ x ⪅ 0.41. The percolation threshold x F near x = 0.41 and the x, T-dependence of the para- to ferro-magnetic phase boundary are quite similar to that found in systems with non-magnetic impurities. Further we report the magnetic moment magnitudes in this percolative system.
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