Spiral order induced by distortion in frustrated square-lattice antiferromagnet

Details Spiral order induced by distortion in frustrated square-lattice antiferromagnet Spiral order induced by distortion in frustrated square-lattice antiferromagnet

2003-06-13

arxiv.org/abs/cond-mat/0306373v3

Phys. Rev. B 69, 092404 (2004)

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages, 1 figure

Scientific paper

10.1103/PhysRevB.69.092404

In a strongly frustrated square-lattice antiferromagnet with diagonal coupling J', for J/(2J') < 1, an incommensurate spiral state with propagation vector Q = (\pi +/- \delta, \pi +/- \delta) near (\pi,\pi) competes closely with the Neel collinear antiferromagnetic ground state. For classical Heisenberg spins the energy of the spiral state can be lowered as it adapts to the distortion of the crystal lattice. As a result, a weak superstructural modulation such as exist in doped cuprates might stabilize an incommensurate spiral phase for some range of the parameter J/(2J') close to 1.

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