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The European Physical Journal B
ISSN: 1434-6028 (printed version)
ISSN: 1434-6036 (electronic version)
Abstract Volume 4 Issue 2 (1998) pp 195-203
A theory of double exchange in infinite dimensions
B.M. Letfulov (a)
Institute of Metal Physics, Ural division of Russian Academy of Sciences, Kovalevskaya str. 18, Ekaterinburg 620219, Russia
Received: 24 January 1997 / Revised: 14 February 1997 / Received in final form: 18 August 1997 / Accepted: 25 August 1997
Abstract: This paper gives a simplified model of the double exchange which is a kind of indirect exchange interaction between localized magnetic moments. The presented model is solved exactly in the case of infinite - dimensional space. Equations for single-particle Green's function and magnetization of the localized spins subsystem are obtained. It is shown that our simple double exchange model reveals an instability to the ferromagnetic ordering of localized moments. Magnetic and electric properties of this system on Bethe lattice with $z=\infty$ are investigated in detail.
PACS. 71.27.+a Strongly correlated electron systems; heavy fermions[:AND:] 68.35.Rh Phase transitions and critical phenomena - 72.10.-d Theory of electronic transport; scatering mechanisms
(a) email: Barri.Letfulov@imp.uran.ru
Article in PDF-Format (406 KB)
Online publication: August 10, 1998
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