Transcription of Thermal and Statistical Physics
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Chapter 5 Magnetic Systemsc 2009 by Harvey Gould and Jan Tobochnik13 August 2009We apply the general formalism of Statistical mechanics developed in Chapter4to the Ising model,a model for which the interactions between the magnetic moments are important. We will findthat these interactions lead to a wide range of interesting phenomena, including the existenceof phase transitions. Computer simulations will be used extensively and a simple, but powerfulapproximation method known as mean-field theory will be ParamagnetismThe most familiar magnetic system in our everyday experience is probably the magnet on yourrefrigerator door.
CHAPTER 5. MAGNETIC SYSTEMS 233 We now use the canonical ensemble formalism that we developed in Section 4.6 to find the thermodynamic properties of the system for a given Tand B.
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