Abstract
We have investigated the structural, magnetic, and thermal transport properties of Co1−xNixCr2O4 (0≤x≤1) to check the evolution of structural and magnetic properties upon the introduction of the Jahn–Teller active ion Ni2+. The x≤0.95 samples can be indexed with a cubic lattice with the space group Fd3m, whereas the x=0.98 sample undergoes a cubic-tetragonal structural transition, and the x>0.98 samples belong to a tetragonal lattice with the space group I41-amd at room temperature. All these samples undergo a paramagnetic–ferrimagnetic transition at TC. A spiral ferrimagnetic ordering at TS is suppressed when the amount of Ni is increased, and the abnormal magnetization at TS for the x=0.6 and 0.8 samples is not pronounced. The measurements of magnetic hysteresis reveal that the x=0.4 and 0.6 samples possess a rather large coercivity HC compared with the x=0 and 1 samples. Specifically, the x=0.4 and 0.6 samples undergo a short-range antiferromagnetic transition above TC. The magnetic properties of the Ni-doped samples can be understood in terms of the magnetic structure model consisting of longitudinal and transverse magnetic sublattices.
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