``Flux'' state in double exchange model
Masanori Yamanaka, Wataru Koshibae, Sadamichi Maekawa
Abstract
We study the ground state properties of the double-exchange systems. The phase factor of the hopping matrix elements arises from t2g spin texture in two or more dimensions. A novel ``flux'' state is stabilized against the canted antiferromagnetic and spiral spin states. In a certain range of hole doping, the phase separation occurs between the ``flux'' state and antiferromagnetic states. Constructing a trial state which provides the rigorous upper bound on the ground state, we show that the metallic canted antiferromagnetic state is not stable in the double exchange model.
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