Ferromagnetism in itinerant two-dimensional t2g systems

Abstract

Motivated by the recent indications of ferromagnetism in transition metal oxide heterostructures, we propose a possible mechanism to generate ferromagnetism for itinerant t2g systems in two spatial dimensions that does not rely on the coupling between local moments and conduction electrons. We particularly emphasize the orbital nature of different bands and show that, when the Fermi level lies near the bottom of the upper bands, a non-perturbative interaction effect due to the quasi-one-dimensional nature of the upper bands may drive a transition to a state in which the upper bands are ferromagnetically polarized. In the quasi-one-dimensional limit, the full thermodynamics may be obtained exactly. We discuss the connection between our mechanism with several itinerant t2g systems that may have ferromagnetic instabilities.

4 pages, 1 table, 1 figure. Accepted by Phys Rev Lett

References in corpus (4)

• Magnetic effects at the interface between nonmagnetic oxides
• High mobility conduction at (110) and (111) LaAlO3/SrTiO3 interfaces
• Carrier-controlled ferromagnetism in SrTiO3
• The itinerant ferromagnetic phase of the Hubbard model

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