Antiferromagnetism of Double Molybdate LiFe(MoO₄)₂

Abstract

The magnetic properties of the spin-5/2 double molybdate LiFe(MoO 4) 2 have been characterized by heat capacity, magnetic susceptibility, and neutron powder diffraction techniques. Unlike the multiferroic system LiFe(WO 4) 2 which exhibits two successive magnetic transitions, LiFe(MoO 4) 2 undergoes only one antiferromagnetic transition at T N ~ 23.8 K. Its antiferromagnetic magnetic structure with the commensurate propagation vector k = (0, 0.5, 0) has been determined. Density functional theory calculations confirm the antiferromagnetic ground state and provide a numerical estimate of the relevant exchange coupling constants.

Incommensurate–commensurate magnetic phase transition in double tungstate Li2Co(WO4)2

“…[32] Recently, we reported a study on double molybdates LiFe(MoO 4 ) 2 . [35] Similar to Li 2 M(WO 4 ) 2 (M = Co, Ni, Cu), LiFe(MoO 4 ) 2 belongs to the triclinic space group P-1 (No. 2).…”

“…NPD revealed that it orders with a commensurate propagation vector 𝑘 = (0, 1/2, 0). [35] The magnetic structure of Li 2 Co(WO 4 ) 2 remains unclear.…”

Structure, vibrational and magnetic characteristics of LiYbX2O8 (X = W, Mo) single-crystals

“…The trivalent rare-earth oxides with 4f electrons are also remarkable for another important physical property which is their magnetic response. LiFe(MoO 4 ) 2 , a member of the double molybdate family, undergoes an antiferromagnetic transition while the multiferroic double tungstate LiFe(WO 4 ) 2 exhibits two successive magnetic transitions [10,11]. It is thus important to characterize the magnetic properties of other Ln-based double molybdates and tungstates such as LiYbX 2 O 8 (X = W, Mo).…”