Enhancement of the magnetic sensitivity of singlet to triplet transition in Fe-dopant Sr3(CrFe)2O8

Magnetizations of the Fe doped Sr3Cr2O8 single crystals Sr3Cr2−xFexO8 (x=0, 0.05 and 0.1) were investigated in the temperature ranging from 2 to 300K and the magnetic field ranging from 0 to 16T. Based on the Curie–Weiss law and the Bleaney–Bowers model, the low field magnetization behaviors were analyzed. Experimental results show that the Fe5+ dopant has influence on the intradimer interaction J0, the interdimer interaction J', and the average change rate Δχ/ΔT of spin-dimer susceptibility χdimer of Sr3Cr2−xFexO8. Especially, in this spin-dimer system, the Fe5+ dopant can obviously enhance the magnetic sensitivity of singlet to triplet transition in Sr3Cr2O8. •Sr3Cr2−xFexO8 (x=0, 0.05 and 0.1) single crystals have been grown successfully.•Magnetization sharply change confirms Sr3Cr2−xFexO8 as a spin-1/2 antiferromagnet.•Fe5+ has influence on J0, J', Δχ/ΔT of spin-dimer susceptibility χdimer.•Fe5+ dopant enhances magnetic sensitivity of Sr3Cr2O8 from singlet to triplet.