2002/09/17 by E. E. Kaul, H. Rösner, H. Rosner +5
Materials Science · Physics and Astronomy · #Advanced Condensed Matter Physics #Magnetic and transport properties of perovskites and related materials #Physics of Superconductivity and Magnetism #cond-mat
paper · pdf · doi:10.1103/physrevb.67.174417
Submitted to Phy. Rev. B
arxiv created 2002/09/17 · openalex publication_date 2003/05/22 · arxiv updated 2009/11/30 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/28
The magnetic behavior 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 and 94 K in Sr2V3O9 and Ba2V3O9, respectively. In Sr2V3O9, antiferromagnetic ordering at TN=5.3K indicate a weak interchain exchange of the order of J_\ensuremath⊥\ensuremath≅2K. 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 \ensuremathχ(T) below 30 K, which we tentatively attribute to a staggered field effect induced by the applied magnetic field. Results of local density approximation 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.