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In particular many-particle systems, phase transitions take place when processes occur that move the system between some disordered phase, characterised by a certain degree of symmetry, and an ordered phase with a smaller degree of symmetry. In this type of order-disorder transition, some macroscopic quantity called the order parameter (here denoted by the symbol ) grows from its original value of zero in the disordered phase. The simplest physical examples of materials exhibiting these transitions are ferromagnetic substances and crystalline matter. At temperatures above a critical temperature TC (the Curie temperature), the stable state of a ferromagnet is disordered and has net magnetisation M = 0; the quantity M in this case plays the role of the order parameter.
Approximate Word count = 427 Approximate Pages = 1.7 (250 words per page double spaced)
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