Spin-flop transitions and spin-wave gaps in La_2CuO_4

Details Spin-flop transitions and spin-wave gaps in La_2CuO_4 Spin-flop transitions and spin-wave gaps in La_2CuO_4

2006-03-03

arxiv.org/abs/cond-mat/0603061v2

Phys. Rev. B 74, 064412 (2006)

Physics

Condensed Matter

Strongly Correlated Electrons

7 pages, 3 figures; added reference

Scientific paper

10.1103/PhysRevB.74.064412

We study the spin-wave spectrum and the spin-flop transitions in La_2CuO_4 in a uniform magnetic field at zero temperature. Using the non-linear sigma-model, we show that a field applied along the orthorhombic b direction leads to a two-step rotation of the staggered magnetization, first in the bc and then in the ac plane, until the order parameter is completely aligned along the c axis. In contrast, for a perpendicular magnetic field, we find a conventional spin-flop transition induced by the competition between the field and the interlayer coupling. A comparison with recent measurements of the field-dependence of the in-plane spin-wave gap shows a beautiful agreement between theory and experiments.

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