Sr2V3O9an

Abstract

The magnetic behaviour of the low-dimensional Vanadium-oxides Sr2V3O9 and Ba2V3O9 was investigated by means of magnetic susceptibility and specific heat measurements. In both compounds, the results can be very well described by an S = 1 2 Heisenberg antiferromagnetic chain with an intrachain exchange of J = 82 K and J = 94 K in Sr2V3O9 and Ba2V3O9, respectively. In Sr2V3O9, antiferromagnetic ordering at TN = 5.3 K indicate a weak interchain exchange of the order of J ⊥ ∼ = 2 K. In contrast, no evidence for magnetic order was found in Ba2V3O9 down to 0.5 K, pointing to an even smaller interchain coupling. In both compounds, we observe a pronounced Curie-like increase of χ(T) below 30 K, which we tentatively attribute to a staggered field effect induced by the applied magnetic field. Results of LDA calculations support the quasi one-dimensional character and indicate that in Sr2V3O9, the magnetic chain is perpendicular to the structural one with the magnetic exchange being transferred through VO4 tetrahedra.

Strong frustration due to competing ferromagnetic and antiferromagnetic interactions: Magnetic properties ofM(VO)2(PO4Nath1, Tsirlin2, Kaul3 et al. 2008Phys. Rev. BSelf Cite431310View full textAdd to dashboardCite

“…Yet in Sr 2 VO(VO 4 ) 2 the spin system is 1D (consistent with the naive expectations), but the spin chains are perpendicular to structural ones (in contrast to the naive expectations). 26 In general, the structures formed by VO 6 octahedra and non-magnetic tetrahedral groups (PO 4 , V +5 O 4 , SiO 4 , etc.) provide a promising way for studying different spin systems, and further investigations could be interesting.…”

Unusual ferromagnetic superexchange in CdVO3: The role of Cd

“…2), with oxygen 2p valence bands below −3 eV and vanadium 3d bands at the Fermi level (E F ), is reminiscent of other V +4 oxides. 16,27 The contribution of cadmium is, however, larger than typical for an alkaline-earth (e.g., Ca The band complex between −0.5 eV and 4.2 eV comprises 24 bands (Fig. 3).…”

“…While details of the interchain couplings and the magnetic ground state may be different (and, in some cases, not fully understood), the AFM nature of the intrachain couplings is safely established experimentally. 27,[44][45][46][47] The key difference between our test systems is the mutual arrangement of the vanadium polyhedra. To analyze the connectivity, we only consider the magnetic unit, a VO 5 square pyramid, despite the actual crystallographic local environment is often described as an octahedron.…”

Frustrated couplings between alternating spin-12chains in AgVOAsO4

“…This arrangement of the magnetic orbital precludes the V-O-V superexchange along the structural chains, and makes the relationship between the crystal structure and the spin lattice rather complex. 11,13,27 In Sec. V, we apply extensive DFT calculations in order to find the correct microscopic model.…”

“…For example, V +4 phosphates are known as a playground for studying spin-1 2 frustrated square lattices. [6][7][8][9][10] Further on, symmetry restrictions on magnetic orbitals induce a variety of one-dimensional (1D) spin lattices in vanadium compounds with 2D 11,12 or even three-dimensional (3D) [13][14][15] crystal structures. In the following, we present an interesting implementation of the quasi-1D spin lattice in the 3D crystal structure of AgVOAsO 4 .…”