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    • Keywords


      Manganites; double-exchange; Hund’s coupling; superexchange

    • Abstract


      We revisit the Anderson-Hasegawa double-exchange model and critically examine its exact solution when the core spins are treated quantum mechanically. We show that the quantum effects, in the presence of an additional superexchange interaction between the core spins, yield a term, the significance of which has been hitherto ignored. The importance of this term is further assessed by numerically exact computation for a four-spin system.

    • Author Affiliations


      P A Sreeram1 Manidipa Mitra1 Sushanta DattaGupta1

      1. S.N. Bose National Centre for Basic Sciences, JD Block, Sector III, Salt Lake City, Kolkata - 700 098, India
    • Dates

  • Pramana – Journal of Physics | News

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      Posted on July 25, 2019

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