Geodesic
Magnetic phase transitions in spin-fluctuation theory
Teoretičeskaâ i matematičeskaâ fizika, Tome 183 (2015) no. 3, pp. 486-497 Cet article a éte moissonné depuis la source Math-Net.Ru

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A first-order phase transition is a characteristic feature of the Gaussian approximation in spin-fluctuation theory. We propose a method for taking the fourth-order terms of the free energy expansion into account using partial averaging. In the example of the Ising model, we show that renormalization of the magnetic susceptibility leads to a second-order phase transition, which is experimentally observed in metals. We use the parameter substitution method to compute the temperature dependence at high temperatures.
Keywords: functional integral method, Stratonovich–Hubbard transformation, partial averaging, renormalization. 
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N. B. Melnikov; G. V. Paradezhenko. Magnetic phase transitions in spin-fluctuation theory. Teoretičeskaâ i matematičeskaâ fizika, Tome 183 (2015) no. 3, pp. 486-497. http://geodesic.mathdoc.fr/item/TMF_2015_183_3_a10/

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