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).

Keywords

• high-temperature magnetic ordering
• linear negative magnetocapacitance
• antiferromagnet with weak ferromagnetism
• neutron powder diffraction
• AC susceptibility
• rutile–related structure