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Rushbrooke inequality : ウィキペディア英語版 | Rushbrooke inequality
In statistical mechanics, the Rushbrooke inequality relates the critical exponents of a magnetic system which exhibits a first-order phase transition in the thermodynamic limit for non-zero temperature ''T''. Since the Helmholtz free energy is extensive, the normalization to free energy per site is given as : The magnetization ''M'' per site in the thermodynamic limit, depending on the external magnetic field ''H'' and temperature ''T'' is given by : where is the spin at the i-th site, and the magnetic susceptibility and specific heat at constant temperature and field are given by, respectively : and : ==Definitions== The critical exponents and are defined in terms of the behaviour of the order parameters and response functions near the critical point as follows :
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