Incommensurate and Collinear Phases in a Doped Quantum Anti-ferromagnet

Details Incommensurate and Collinear Phases in a Doped Quantum Anti-ferromagnet Incommensurate and Collinear Phases in a Doped Quantum Anti-ferromagnet

1994-07-02

arxiv.org/abs/cond-mat/9407007v1

Physics

Condensed Matter

Tex, 12 pages. Published in J. Phys. Condens. Matt., 5 (1993) 8595-8602

Scientific paper

10.1088/0953-8984/5/45/012

The Schwinger Boson mean field theories of the `t-J' model are extended by the consideration of anisotropic order parameters. This has two effects. First, a collinear phase, in which the spins are anti-ferromagnetically aligned in one direction and ferromagnetically aligned in the other, is found to be stable over a significant range of the phase diagram. Second, the (1,1) and (1,0) spiral phases become very close in energy. The inclusion of weak intra-sublattice coupling may therefore stabilise the (1,0) spiral with respect to the (1,1) spiral, thus harmonising theory and experiment.

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