``Flux'' state in double exchange model

Details ``Flux'' state in double exchange model ``Flux'' state in double exchange model

1998-07-12

arxiv.org/abs/cond-mat/9807173v1

Physics

Condensed Matter

Statistical Mechanics

REVTEX, 8 pages and 4 PS figures

Scientific paper

10.1103/PhysRevLett.81.5604

We study the ground state properties of the double-exchange systems. The phase factor of the hopping matrix elements arises from $t_{2g}$ 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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