Abstract
The magnetic composition–temperature(x–T) phase diagram of themixed kagome system (CoxNi1−x)3V2O8 (CNVO) deduced from neutron powder diffraction and single-crystalheat capacity experiments is presented. CNVO changes its magneticstructure twice below 5.5 K as a function of the compositional parameterx. A samplewith x = 0.98 has been found to be of a critical composition where both ferromagnetic and antiferromagnetic reflectionsof the Co3V2O8 (CVO) type magnetic structure have been observed in the diffraction pattern.Below this composition the ferromagnetic phase is completely suppressed andantiferromagnetic short-range order is present, which is modulated by a propagation vectork1 = (0,δ,0) with δ being temperature and composition dependent. Below 4.2 Kδ has a constantvalue of 0.4 for 0.76<x<0.92. In the region 0.71<x<0.76 a change of the magnetic structure into the long-range orderedNi3V2O8 (NVO) typewith k2 = (δ,0,0), whereδ is only dependenton x, takes place.Finally, for x<0.035 the positions of the magnetic reflections become temperature dependent again.
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