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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
: f = -kT \lim_ \frac\log Z_N
The magnetization ''M'' per site in the thermodynamic limit, depending on the external magnetic field ''H'' and temperature ''T'' is given by
: M(T,H) \ \stackrel\ \lim_ \frac \left( \sum_i \sigma_i \right) = - \left( \frac \right)_T
where \sigma_i is the spin at the i-th site, and the magnetic susceptibility and specific heat at constant temperature and field are given by, respectively
: \chi_T(T,H) = \left( \frac \right)_T
and
: c_H = -T \left( \frac \right)_H.
==Definitions==
The critical exponents \alpha, \alpha', \beta, \gamma, \gamma' and \delta are defined in terms of the behaviour of the order parameters and response functions near the critical point as follows
: M(t,0) \simeq (-t)^\mboxt \uparrow 0

: M(0,H) \simeq |H|^ \operatorname(H)\mboxH \rightarrow 0

: \chi_T(t,0) \simeq \begin

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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