Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2005-09-10
Phys. Rev. B 73, 140405(R) (2006)
Physics
Condensed Matter
Strongly Correlated Electrons
11 pages, 3 figures, published version
Scientific paper
10.1103/PhysRevB.73.140405
Using dynamical mean-field theory, we have evaluated the magnetic instabilities and T=0 phase diagram of the double-exchange model on a Bethe lattice in infinite dimensions. In addition to ferromagnetic (FM) and antiferromagnetic (AF) phases, we also study a class of disordered phases with magnetic short-range order (SRO). In the weak-coupling limit, a SRO phase has a higher transition temperature than the AF phase for all fillings p below 1 and can even have a higher transition temperature than the FM phase. At T=0 and for small Hund's coupling J_H, a SRO state has lower energy than either the FM or AF phases for 0.26\le p < 1. Phase separation is absent in the J_H --> 0 limit but appears for any non-zero value of J_H.
Alvarez Gonzalo
Fishman Randy S.
Maier Th.
Moreno Jackeline
Popescu Florin
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