Magnetic properties and linear negative magnetocapacitance in rutile like LiFe₂SbO₆

Abstract We report the high-temperature magnetic ordering and the observation of linear negative magnetocapacitance mediated by a low-temperature magnetic phase crossover in the compound LiFe 2 SbO 6 . The combined observations of the absence of a second harmonic generation (SHG) signal, and Rietveld refinements of x-ray and neutron powder diffraction (NPD) patterns of the sample confirm that LiFe 2 SbO 6 crystalizes in a centrosymmetric Pnnm structure. The DC magnetization measurements reveal that an antiferromagnetic ordering sets in at high temperature ( T N = 850). The magnetic anomaly in the DC magnetization at a lower temperature T = 13 K, is corroborated by AC susceptibility and the specific heat measurements. In association with this magnetic phase crossover, a linear negative magnetocapacitance was observed below this temperature. Further, the neutron powder diffraction study reveals a collinear antiferromagnetic ordering with a wavevector k = (0, 0, 0).