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Local vs. Global Variables for Spin Glasses

We discuss a framework for understanding why spin glasses differ so remarkably from homogeneous systems like ferromagnets, in the context of the sharply divergent low temperature behavior of shortand infinite-range versions of the same model. Our analysis is grounded in understanding the distinction between two broad classes of thermodynamic variables – those that describe the global features o...

Spin Glasses

The understanding of random magnetic systems known as spin glass has been one of the major challenges in condensed matter physics over that past two decades. Study of this state can be thought of as a rst step towards understanding more complex and disordered systems.This paper reviews some of the theoretical developmets in this eld and tries to answer the question how well are these systems un...

Spin Glasses

An introduction and overview is given of the theory of spin glasses and its application .

Cooperative freezing in spin glasses and magnetic nanostructures

Scaling in spin-glasses.

Many results of the mean-field theory of spin-glasses violate simple scaling laws, including the magnetic field dependence of the transition lines, crossover effects of random anisotropy, and critical behavior in the ordered phase. These violations arise from two dangerously irrelevant variables. Below eight dimensions some mean-field exponents change and at d = 6 scaling is restored. Below d =...