Effective One-Dimensional Coupling in the Highly Frustrated Square-Lattice Itinerant Magnet

A Sapkota, BG Ueland, VK Anand, NS Sangeetha… - Physical Review Letters, 2017 - APS
Physical Review Letters, 2017APS
Inelastic neutron scattering measurements on the itinerant antiferromagnet CaCo 2-y As 2 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 J 1-J 2 Heisenberg model on a square lattice with ferromagnetic J 1 and hence indicate
that the extensive previous experimental and theoretical study of the J 1-J 2 Heisenberg …
Inelastic neutron scattering measurements on the itinerant antiferromagnet 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 Heisenberg model on a square lattice with ferromagnetic and hence indicate that the extensive previous experimental and theoretical study of the Heisenberg model on local-moment square spin lattices should be expanded to include itinerant spin systems.
American Physical Society
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