Spin canting as a result of the competition between stripes and spirals in cuprates

Details Spin canting as a result of the competition between stripes and spirals in cuprates Spin canting as a result of the competition between stripes and spirals in cuprates

2010-11-19

arxiv.org/abs/1011.4447v1

Physics

Condensed Matter

Strongly Correlated Electrons

10 pages, 5 figures

Scientific paper

Based on the extended Hubbard model we calculate the energy of stripe and spiral ground states. We find that uniform spirals get favored by a large $t'/t$ ratio but are unstable at small doping towards stripes and checkerboard textures with spin canting. The structure of these inhomogeneities also depends on t'/t and the associated spin currents may induce a small lattice distortion associated with local dipole moments. We discuss a new kind of stripe which appears as a domain wall of the antiferromagnetic (AF) order parameter with a fractional change of the phase of the AF order. For large |t'/t| spirals can be stabilized under certain conditions in the overdoped regime which may explain the elastic incommensurate magnetic response recently observed in iron-codoped Bi2201 materials.

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