Topological Scenario for Stripe Formation in Manganese Oxides
2000; American Physical Society; Volume: 84; Issue: 11 Linguagem: Inglês
10.1103/physrevlett.84.2477
ISSN1092-0145
AutoresTakashi Hotta, Y. Takada, Hiroyasu Koizumi, E. Dagotto,
Tópico(s)Physics of Superconductivity and Magnetism
ResumoThe spin-charge-orbital complex structures of manganites are studied using topological concepts. The key quantity is the ``winding number'' $w$ associated with the Berry-phase connection of an ${e}_{g}$ electron parallel transported through Jahn-Teller centers, along zigzag one-dimensional paths in an antiferromagnetic environment of ${t}_{2g}$ spins. From these concepts, it is shown that the ``bi-stripe'' and ``Wigner-crystal'' states observed experimentally have different $w$'s. Predictions for the spin structure of the charge-ordered states for heavily doped manganites are discussed.
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