A microscopic theory of phase transitions
Presented by Dr. Volkmar NOLTING on 10 Jul 2014 from 15:00 to 15:20
Type: Oral Presentation
Track: Track A - Division for Physics of Condensed Matter and Materials
A microscopic theory of phase transitions is presented that describes macroscopic phenomena on the basis of microscopic interactions between particles. It is shown that the equation of state p(T,V) of a gas and the spontaneous magnetization M<sub>S</sub>(T) of a ferromagnetic insulator only exhibit phase transitions in the thermodynamic limit thus describing an infinitely large system. There are no phase transitions observed in the case of a finite system. A Curie temperature is calculated in agreement with experimental realizations of the theoretical model. Furthermore, the results depend on the dimension d of the spin lattice thereby confirming the Mermin Wagner theorem.