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The European Physical Journal B
ISSN: 1434-6028 (printed version)
ISSN: 1434-6036 (electronic version)
Abstract Volume 5 Issue 3 (1998) pp 473-478
Microscopic conditions favoring itinerant ferromagnetism: Hund's rule coupling and orbital degeneracy
K. Held (a), D. Vollhardt
Theoretische Physik III, Elektronische Korrelationen und Magnetismus, Universität Augsburg, 86135 Augsburg, Germany
Received: 26 February 1998 / Accepted: 17 April 1998
Abstract: The importance of Hund's rule coupling for the stabilization of itinerant ferromagnetism is investigated within a two-band Hubbard model. The magnetic phase diagram is calculated by finite-temperature quantum Monte-Carlo simulations within the dynamical mean-field theory. Ferromagnetism is found in a broad range of electron fillings whereas antiferromagnetism exists only near half filling. The possibility of orbital ordering at quarter filling is also analyzed.
PACS. 71.27.+a Strongly correlated electron systems; heavy fermions - 75.10.Lp Band and itinerant models - 75.30.Kz Magnetic phase boundaries
(a) email: held@physik.uni-augsburg.de
Article in PDF format (312 KB)
Online publication: October 26, 1998
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