Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2010-11-10
Phys. Rev. B 83, 125110 (2011)
Physics
Condensed Matter
Strongly Correlated Electrons
7 pages, 7 figures
Scientific paper
10.1103/PhysRevB.83.125110
We study the effects of temperature and magnetic field on a two-orbital Hubbard model within dynamical mean field theory. We focus on the quarter filled system, which is a special point in the phase diagram due to orbital degeneracy. At this particular filling the model exhibits two different long-range order mechanisms, namely orbital order and ferromagnetism. Both can cooperate but do not rely on each other's presence, creating a rich phase diagram. Particularly, in the vicinity of the phase transition to an orbitally ordered ferromagnetic state, we observe a strong magnetoresistance effect. Besides the low temperature phase transitions, we also observe a crossover between a paramagnetic insulating and a paramagnetic metallic state for increasing Hund's coupling at high temperatures.
Kawakami Norio
Peters Robert
Pruschke Thomas
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