  The low temperature properties of double exchange model in triangular lattice
are investigated via truncated polynomial expansion method (TPEM), which
reduces the computational complexity and enables parallel computation. We found
that for the half-filling case a stable 120-degree spin configuration phase
occurs owing to the frustration of triangular lattice and is further stabilized
by antiferromagnetic (AF) superexchange interaction, while a transition between
a stable ferromagnetic (FM) phase and a unique flux phase with small
finite-size effect is induced by AF superexchange interaction for the
quarter-filling case.
