Short-Range Magnetic Order in Iron and Nickel
The concept of short-range order is important and widespread in physics. That short-range order exists and explains many phenomena is accepted as commonplace in the theories of liquids, alloys, and glasses. The reason for short- range order at a given temperature is the same as the reason for any order, namely that in the competition to raise the entropy, while lowering the energy, the amount of energy gained by ordering wins out over the entropy lost. Clearly, an understanding of the energetics of ordering is important, and so is an understanding of the entropy. It is the latter which is usually the most difficult to come to grips with.
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