2005/01/14 by Angsula Ghosh, E. Miranda
Physics and Astronomy · #cond-mat.str-el
paper · pdf · doi:10.1103/physrevb.70.214420
published as Phys. Rev. B 70, 214420 (2004) · 5 pages, 7 figures
arxiv created 2005/01/14 · arxiv updated 2009/12/01
The two-dimensional Kondo lattice model with both nearest and next-nearest neighbor exchange interactions is studied within a mean-field approach and its phase diagram is determined. In particular, we allow for lattice translation symmetry breaking. We observe that the usual uniform inter-site order parameter is never realized, being unstable towards other more complex types of order. When the nearest neighbor exchange J1 is ferromagnetic the flux phase is always the most stable state, irrespective of the value of the next-nearest-neighbor interaction J2. For antiferromagnetic J1, however, either a columnar or a flux phase is realized, depending on conduction electron filling and the value of J2.