Simulation of hysteresis for +/- J triangular lattices

We report Monte Carlo simulations of low-temperature hysteresis of +/-J Isi ng triangular lattices. A hysteresis loop similar to the one shown by real spin glasses is found. Such loop is divided in six sectors, according to th e coordination number. Average hysteresis curves, obtained over large numbe rs of randomly prepared samples, are discussed for different values of temp erature (T): it is found that the hysteresis loop disappears for T greater than or equal to 2.2J. Characteristics of the zero-temperature curve are ex plained by probabilistic analysis. (C) 2000 Elsevier Science B.V. All right s reserved.