Influence of Quasi-Bi-Stripe Charge Order on Resistivity and Magnetism in the Bilayer Manganite La2-2xSr1+2xMn2O7.

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  • Kubota Masato
    Neutron Scattering Laboratory, I.S.S.P., University of Tokyo, Tokai, Ibaraki 319–1106
  • Oohara Yasuaki
    Neutron Scattering Laboratory, I.S.S.P., University of Tokyo, Tokai, Ibaraki 319–1106
  • Yoshizawa Hideki
    Neutron Scattering Laboratory, I.S.S.P., University of Tokyo, Tokai, Ibaraki 319–1106
  • Fujioka Hirofumi
    CREST, Department of Physics, Tohoku University, Aoba–ku, Sendai 980–8578
  • Shimizu Kouichirou
    Neutron Scattering Laboratory, I.S.S.P., University of Tokyo, Tokai, Ibaraki 319–1106
  • Hirota Kazuma
    CREST, Department of Physics, Tohoku University, Aoba–ku, Sendai 980–8578
  • Moritomo Yutaka
    Center for Integrated Research in Science and Engineering, Nagoya University, Nagoya 464–8601
  • Endoh Yasuo
    Institute for Materials Research, Tohoku University, Aoba–ku, Sendai 980–8577

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  • Influence of Quasi-Bi-Stripe Charge Order on Resistivity and Magnetism in the Bilayer Manganite La<sub><b>2</b>-<b>2</b><i><i>x</i></i></sub>Sr<sub><b>1</b>+<b>2</b><i><i>x</i></i></sub>Mn<sub><b>2</b></sub>O<sub><b>7</b></sub>

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Charge ordering in the bilayer manganite system La2-2xSr1+2xMn2O7 with 0.30 ≤ x ≤ 0.50 is studied by neutron diffraction. The charge order is characterized by the propagation vector parallel to the [1 0 0] direction (MnO2 direction), but the correlation length is short-ranged and extremely anisotropic, being ∼0.02a* and ∼0.2a* parallel and perpendicular to the modulation direction, respectively. The observed charge order can be viewed as a quasi-bistripe order, and accounts well for the x dependence of the resistivity. The quasi-bistripe order is stable within the ferromagnetic (FM) MnO2 layers in the A-type antiferromagnetic order, but is destabilized by the three dimensional FM order.

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