What is a spin glass?

As mentioned previously , structural glasses are materials in which there is no periodic lattice (no long-range spatial order) and the building blocks get "stuck" in some configuration, kinetically unable to get to the true energetic minimum state which would almost certainly be a periodic crystal.  Upon cooling from the liquid state, their viscosity increases by many orders of magnitude ( in various ways ) until they act like rigid solids.  Distinguishing "glassy" physics includes strongly inte