Long-range antiferromagnetic order and possible field induced spin-flop transition in BiMnVO₅

Abstract

We report the bulk magnetic characterization of a dimeric chain material, BiMnVO, by means of magnetic susceptibility, magnetization and heat capacity measurements. Our results provide compelling evidence of an antiferromagnetic (AFM) transition at (T ) ~ 11.5 K. Moreover, the magnetic entropy change in zero field saturates to 14.6 J mol K which is close to the total spin entropy of Mn. The development of long-range magnetic order in this chain material demonstrates the interplay of strong intra-chain and inter-chain interactions between the dimers, in addition to the intra-dimer interaction. Low-temperature (T < T ) heat capacity data indicate the presence of a gap (Δ/k ≈ 5 K) in the spin excitations. Furthermore, the isothermal magnetization below T shows an anomaly in the slope between 30 and 40 kOe which is suggestive of a spin-flop transition. Such a low-field spin-flop transition and gapped spin wave excitations may be attributed to the presence of (weak) magnetic anisotropy in this material. We attempt to construct a phase diagram in the magnetic field-temperature plane by extracting data from in-field heat capacity and isothermal magnetization measurements.

Development of short and long-range magnetic order in the double perovskite based frustrated triangular lattice antiferromagnet Ba2MnTeO6

“…A broad maximum at 10 K in magnetic specific heat data suggests the presence of gapped magnon excitation in the ground state. Similar types of broad maxima were also observed in BiMnVO 5 and MnWO 4 which indicates Mn 2+ ions are subjected to anisotropic magnetic interactions [53,70]. In BMTO, the estimated magnon excitation gap is 1.4 K, a similar value of magnon excitation gap is also observed in MnWO 4 [56].…”

Effects of the Hubbard potential on the NMR shielding and optoelectronic properties of BiMnVO5 compound

“…This resulted in the identification of several new compounds, including BiSr 2 V 3 O 11 , BiCa 4 V 3 O 23 , BiBa 2 V 3 O 11 , BiBa 2 V 2 PO 11 , BiMg 2 AsO 6 , BiCa 2 VO 6 , BiCd 2 VO 6 , BiCdVO 5 , Bi 3 Ca 9 V 11 O 41 , Bi 2 CaV 2 O 9 , Bi 1−2x A 2x VO 4-x , BiMg 2 VO 6 , and all these compounds were made in an atmosphere of air. Some of these novel compounds showed remarkable characteristics such as nonlinear optical response, ferroelectricity and high oxygen ion conductivity 1 , 2 . All Mn (II) oxides were reported to be produced in the BiMnVO 5 under vacuum or inert-gas conditions.…”

“…Despite the synthesis of several compounds containing the magnetic M 2+ ion, only a small amount of research has been focused on the magnetic characterization of these materials. Due to their unusual (zigzag) spin ladder architecture, the phases BiM 2 V( P )O 6 (M = Cu, Mn) have drawn significant attention in terms of their magnetic properties 2 , 3 . Low-temperature co-fired ceramics such as BiMVO 5 (M = Ca, Mg) compounds have attracted considerable attention because of their potential applications in microwave dielectric ceramics, ferroelectric devices, and nonlinear optoelectronics 4 .…”

“…A robust interplay of intra-dimer and inter-dimer (both intra-chain and inter-chain) contacts has been used to explain the long-range antiferromagnetic ordering. With an increase in magnetic field, inconsistency in heat capacity corresponds to the AFM transition to lower temperatures 2 , 3 .…”