Double exchange alone does not explain the resistivity of La1-xSrxMnO3

  • Millis A
  • Littlewood P
  • Shraiman B
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The La1-xSrxMnO3 system with 0.2≲x≲0.4 has traditionally been modeled with a “double-exchange” Hamiltonian in which it is assumed that the only relevant physics is the tendency of carrier hopping to line up neighboring spins. We present a solution of the double-exchange model, show it is incompatible with many aspects of the data, and propose that in addition to double-exchange physics a strong electron-phonon interaction arising from the Jahn-Teller splitting of the outer Mn d level plays a crucial role.

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  • A. J. Millis

  • P. B. Littlewood

  • B. I. Shraiman

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