Article Dans Une Revue Physical Review B: Condensed Matter and Materials Physics (1998-2015) Année : 2006

Plaquette valence-bond crystal in the frustrated Heisenberg quantum antiferromagnet on the square lattice

Résumé

Using both exact diagonalizations and diagonalizations in a subset of short-range valence bond singlets, we address the nature of the groundstate of the Heisenberg spin-1/2 antiferromagnet on the square lattice with competing next-nearest and next-next-nearest neighbor antiferromagnetic couplings (J1-J2-J3 model). A detailed comparison of the two approaches reveals a region along the line (J2+J3)/J1=1/2, where the description in terms of nearest-neighbor singlet coverings is excellent, therefore providing evidence for a magnetically disordered region. Furthermore a careful analysis of dimer-dimer correlation functions, dimer structure factors and plaquette-plaquette correlation functions provides striking evidence for the presence of a plaquette valence bond solid order in part of the magnetically disordered region.

Dates et versions

hal-00169812 , version 1 (05-09-2007)

Identifiants

Citer

Matthieu Mambrini, Andreas Laeuchli, Didier Poilblanc, Frédéric Mila. Plaquette valence-bond crystal in the frustrated Heisenberg quantum antiferromagnet on the square lattice. Physical Review B: Condensed Matter and Materials Physics (1998-2015), 2006, 74, pp.144422. ⟨10.1103/PhysRevB.74.144422⟩. ⟨hal-00169812⟩
131 Consultations
0 Téléchargements

Altmetric

Partager

  • More