This article is cited in 10 papers

Transverse susceptibility and the $T^{3/2}$ law in the dynamic spin-fluctuation theory

N. B. Melnikov^a, B. I. Reser<sup>b

a</sup> Lomonosov Moscow State University, Moscow, Russia
^b Institute of Metal Physics, Ural Branch, RAS, Ekaterinburg, Russia

Abstract: We obtain explicit expressions for elements of the magnetic susceptibility tensor in the dynamic spin-fluctuation theory. Using an analytic continuation of the Green's functions, we show that the transverse susceptibility has spin-wave poles at low temperatures, yielding the asymptotic $T^{3/2}$ law for magnetization. We derive an explicit expression for the coefficient in the $T^{3/2}$ law based on the multiband Hubbard Hamiltonian and real band structure. We demonstrate the correct low-temperature behavior of magnetization in the example of iron.

Keywords: spin fluctuation, dynamic susceptibility, magnetization, $T^{3/2}$ law, low temperature.

Received: 29.05.2014
Revised: 07.07.2014

DOI: 10.4213/tmf8718

 English version: Theoretical and Mathematical Physics, 2014, 181:2, 1435–1447

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