Microscopic conditions favoring itinerant ferromagnetism: Hund's rule coupling and orbital degeneracy |
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| Authors: | K Held D Vollhardt |
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| Institution: | Theoretische Physik III, Elektronische Korrelationen und Magnetismus, Universit?t Augsburg, 86135 Augsburg, Germany, DE
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| 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.
Received: 26 February 1998 / Accepted: 17 April 1998 |
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| Keywords: | PACS 71 27 +a Strongly correlated electron systems heavy fermions - 75 10 Lp Band and itinerant models - 75 30 Kz Magnetic phase boundaries |
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