Anomalous Lattice Distortion in Pr-Substituted Double-Layered Perovskite Manganite La1.2Sr1.8Mn2O7 Single Crystals: II.

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  • Matsukawa Michiaki
    Department of Materials Science and Technology, Iwate University, Morioka 020-8551
  • Ogasawara Hiromitsu
    Department of Materials Science and Technology, Iwate University, Morioka 020-8551
  • Sasaki Toru
    Department of Materials Science and Technology, Iwate University, Morioka 020-8551
  • Yoshizawa Masahito
    Department of Materials Science and Technology, Iwate University, Morioka 020-8551
  • Apostu M.
    Laboratoire de Physico-Chimie de L'état Solide, CNRS, UMR 8648, Université Paris-Sud, 91405 Orsay, France
  • Suryanarayanan R.
    Laboratoire de Physico-Chimie de L'état Solide, CNRS, UMR 8648, Université Paris-Sud, 91405 Orsay, France
  • Revcolevschi A.
    Laboratoire de Physico-Chimie de L'état Solide, CNRS, UMR 8648, Université Paris-Sud, 91405 Orsay, France
  • Itoh Kikuo
    National Institute for Materials Science, Tsukuba 305-0003
  • Kobayashi Norio
    Institute for Materials Research, Tohoku University, Sendai 980-8577

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  • Anomalous Lattice Distortion in Pr-Substituted Double-Layered Perovskite Manganite La1.2Sr1.8Mn2O7 Single Crystals(2)
  • Anomalous Lattice Distortion in Pr-Substituted Double-Layered Perovskite Manganite La<sub>1.2</sub>Sr<sub>1.8</sub>Mn<sub>2</sub>O<sub>7</sub>Single Crystals: II

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Thermal expansion and magnetostriction both in the ab-plane and along the c-axis of double-layered perovskite manganite (La1-zPrz)1.2Sr1.8Mn2O7 (z=0, 0.2, 0.4 and 0.6) single crystals have been measured as a function of temperature and magnetic field. The anomalous lattice distortion and the giant magnetostriction associated with the CMR were observed near the PI to FM transition temperature Tc. These findings indicate that the PI to FM transition and the CMR near Tc are not associated with the anisotropic lattice striction concerning the static John-Teller effect but with the negative volume striction related to the delocalization of polarons to itinerant carriers.

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