Spin Glasses are prototype of disordered systems.

Despite the fact that much effort has been undertaken in studying them, their physics is not yet fully understood. Spin glasses are certain alloys, e.g.,CuMn. In the seventies, researchers found that these materials
exhibited an unknown form of magnetism in which the spins are locally frozen at low temperatures but disordered such that there is no overall magnetization. Deeper insight into spin-glass physics could be
gained by both theoretical investigations and a detailed analysis of numerically generated data.  Now spin glasses are considered important representatives of disordered systems. They are often studied in the
long-range Sherrington-Kirkpatrick limit or in the
short-range Edwards-Anderson model. Couplings between spins are drawn from a disorder, e.g., a Gaussian or a bimodal distribution in both models.