Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
1999-10-15
Journal of the Physical Society of Japan, 69 Suppl B, 1 (2000)
Physics
Condensed Matter
Strongly Correlated Electrons
18 pages, 8 figures. Proceedings of the International Workshop on Magnetic Excitations in Strongly Correlated Electrons, Hamam
Scientific paper
It was argued many years ago that translational symmetry breaking due to the appearance of spin-Peierls ordering (or bond-charge stripe order) is a fundamental property of the quantum paramagnetic states of a large class of square lattice antiferromagnets. Recently, such states were shown to be a convenient point of departure for studying translational symmetry breaking in doped antiferromagnets: these results are briefly reviewed here with an emphasis on experimental implications. In the presence of stronger frustration, it was also argued that the insulating antiferromagnet can undergo a transition to a deconfined state with no lattice symmetry breaking. This transition is described by a fully-frustrated Ising model in a transverse field: details of this earlier derivation of the Ising model are provided here--this is motivated by the reappearance of the same Ising model in a recent study of the competition between antiferromagnetism and d-wave superconductivity by Senthil and Fisher (cond-mat/9910224).
Sachdev Subir
Vojta Matthias
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