Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2004-02-04
International Journal of Modern Physics B 5, 219 (1991)
Physics
Condensed Matter
Strongly Correlated Electrons
38 pages, 5 figures; as published in the pre-cond-mat dark ages, of possible relevance to the experiments reported in cond-mat
Scientific paper
A large N expansion technique, based on symplectic (Sp(N)) symmetry, for frustrated magnetic systems is studied. The phase diagram of a square lattice, spin S, quantum antiferromagnet with first, second and third neighbor antiferromagnetic coupling (the J_1-J_2-J_3 model) is determined in the large-N limit and consequences of fluctuations at finite N for the quantum disordered phases are discussed. In addition to phases with long range magnetic order, two classes of disordered phases are found: (i) states similar to those in unfrustrated systems with commensurate, collinear spin correlations, confinement of spinons, and spin-Peierls or valence-bond-solid order controlled by the value of 2S(mod 4) or 2S(mod 2); (ii) states with incommensurate, coplanar spin correlations, and unconfined bosonic spin-1/2 spinon excitations. The occurrence of ``order from disorder'' at large S is discussed. Neither chirally ordered nor spin nematic states are found. Initial results on superconductivity in the t-J model at N=infinity and zero temperature are also presented.
Read Nicholas
Sachdev Subir
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