首页|Defect-manipulated magnetoresistance and above-room-temperature ferromagnetism in two-dimensional BaNi2V2O8
Defect-manipulated magnetoresistance and above-room-temperature ferromagnetism in two-dimensional BaNi2V2O8
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The intricate correlation between multiple degrees of freedom and physical properties is a fascinating area in solid state chemistry and condensed matter physics.Here,we report a quantum-magnetic system BaNi2V2O8(BNVO),in which the spin correlation was modulated by unusual oxidation state,leading to different magnetic behavior.The BNVO was modified with topochemical reduction(TR)to yield TR-BNVO with partially reduced valance state of Ni+in the two-dimensional NiO6-honeycomb lattice.Accordingly,the antiferromagnetic order is suppressed by the introduction of locally interposed Ni+and oxygen va-cancies,resulting in a ferromagnetic ground state with the transition temperature up to 710 K.A posi-tive magnetoresistance(7.5％)was observed in the TR-BNVO at 40 K under 7 T.These findings show that topological reduction is a powerful approach to engineer low-dimensional materials and accelerate the discovery of new quantum magnetism.
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