Phase Diagram and Dynamical Structure Factor for Frustrated Antiferromagnets: A Schwinger Boson Mean Field Study

Ciudad Autónoma de Buenos Aires

Otro; XIIº Giambiagi School: "Low dimensional condensed matter"; 2010

We present the SU(2) invariant formulation of the Schwinger Boson Mean Field Theory (SBMFT) for the J1 − J3 Heisenberg Model in a square lattice. The magnetic phase diagram obtained for different values of spin and frustration presents regions with short range and long range spatial correlations with Neel or incommensurate spiral orders. Besides we analize the behavior of the magnetic excitation spectrum through the Dynamical Structure Factor, which can be interpreted in terms of spinonic excitations