Inelastic neutron scattering measurements on the itinerant antiferromagnet (AFM) CaCo2−yAs2 at a temperature of 8 K reveal two orthogonal planes of scattering perpendicular to the Co square lattice in reciprocal space, demonstrating the presence of effective one-dimensional spin interactions. These results are shown to arise from near-perfect bond frustration within the J1-J2 Heisenberg model on a square lattice with ferromagnetic J1, and hence indicate that the extensive previous experimental and theoretical study of the J1-J2 Heisenberg model on local-moment square spin lattices should be expanded to include itinerant spin systems.
@article{arxiv.1708.01804,
title = {Effective One-Dimensional Coupling in the Highly-Frustrated Square-Lattice Itinerant Magnet CaCo$_{\mathrm{2}-y}$As$_{2}$},
author = {A. Sapkota and B. G. Ueland and V. K. Anand and N. S. Sangeetha and D. L. Abernathy and M. B. Stone and J. L. Niedziela and D. C. Johnston and A. Kreyssig and A. I . Goldman and R. J. McQueeney},
journal= {arXiv preprint arXiv:1708.01804},
year = {2017}
}