Li2VO(Si,Ge)O4, a Prototype of a Two-Dimensional Frustrated Quantum Heisenberg Antiferromagnet

2000/05/17 by R. Melzi, Roberto Melzi, P. Carretta +8 · 2 citations
Chemistry · Physics and Astronomy · #Advanced Condensed Matter Physics #Inorganic Fluorides and Related Compounds #Physics of Superconductivity and Magnetism #cond-mat.str-el

paper · pdf · doi:10.1103/physrevlett.85.1318

published as Phys. Rev. Lett. 85, 1318 (2000) · 4 pages, 4 figures

arxiv created 2000/05/17 · openalex publication_date 2000/08/07 · arxiv updated 2009/11/30 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/28

Abstract

NMR and magnetization measurements in Li₂VOSiO₄ and Li₂VOGeO₄ are reported. The analysis of the susceptibility shows that both compounds are two-dimensional S\phantom\rule0ex0ex=\phantom\rule0ex0ex1/2 Heisenberg antiferromagnets on a square lattice with a sizable frustration induced by the competition between the superexchange couplings J₁ along the sides of the square and J₂ along the diagonal. Li₂VOSiO₄ undergoes a low-temperature phase transition to a collinear order, as theoretically predicted for J₂/J₁>0.5. Just above the magnetic transition the degeneracy between the two collinear ground states is lifted by the onset of a structural distortion.

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