Single-particle spectrum of the flux phase in the FM Kondo model

Abstract We investigate the 2D ferromagnetic Kondo lattice model for manganites with classical corespins at Hund's rule coupling J H = 6 , with antiferromagnetic superexchange 0.03 ⩽ J ′ ⩽ 0.05 . We employ canonical and grand canonical unbiased Monte Carlo simulations and find paramagnetism, weak ferromagnetism and the flux phase, depending on doping and on J ′ . The observed single-particle spectrum in the flux phase differs from the idealized infinite lattice case, but agrees well with an idealized finite lattice case with thermal fluctuations.