Emerging exotic phases in magnetic spin systems due to RKKY interaction

ATILIO VELA WAC; F. A. GÓMEZ ALBARRACÍN; D. C. CABRA

Congreso; SIMAFE 2021 - International Seminar on Condensed Matter Physics and Statistical Physics; 2021

Universidad de la Frontera

(poster) The competition between exchange and RKKY interactions may lead to effective frustrated systems. The origin of the RKKY term is due to interaction of magnetic moments with itinerant electrons; it is, in principle, long-ranged, and depends on the Fermi momentum of the electrons and a global coupling constant. In this work, we propose to study a simple model for Ising spins in the square lattice, considering both ferromagnetic and antiferromagnetic exchange couplings and com-peting RKKY interactions. We analyze what values of the coupling constants and the Fermi momentum lead to systems with stronger magnetic frustration, focusing around the parameters where the effective nearest neighbor coupling is suppressed.We explore the low temperature phases numerically, using the Monte Carlo Metropolis algorithm. We find that competing interactions in combination with an external magnetic field give rise to a plethora of exotic plateaux. This is a first step towards exploring the effect of RKKY interactions in more complex systems.