Small-Angle Neutron Scattering Study on Ferromagnetic Correlation in (La,Tb)<sub>2/3</sub>Ca<sub>1/3</sub>MnO<sub>3</sub>

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  • Watahiki Masaya
    Advanced Science Research Center, Japan Atomic Energy Research Institute, Tokai-mura, Ibaraki 319-1195 Japan Science and Technology Corporation, Kawaguchi, Saitama 332-0012
  • Metoki Naoto
    Advanced Science Research Center, Japan Atomic Energy Research Institute, Tokai-mura, Ibaraki 319-1195
  • Suzuki Jun-ichi
    Advanced Science Research Center, Japan Atomic Energy Research Institute, Tokai-mura, Ibaraki 319-1195
  • Oikawa Ken-ichi
    National Institute of Materials and Chemical Research, Tsukuba, Ibaraki 305-8565
  • Nie Jiacai
    Electrotechnical Laboratory, Umezono, Tsukuba, Ibaraki 305-8568 National Laboratory for Superconductivity, Center for Condensed Matter Physics & Institute of Physics, Chinese Academy of Sciences, Beijing 100080, China
  • Tachiki Masashi
    Advanced Science Research Center, Japan Atomic Energy Research Institute, Tokai-mura, Ibaraki 319-1195 National Research Institute for Metals, Tsukuba, Ibaraki 305-0047
  • Yamada Yasusada
    Advanced Science Research Center, Japan Atomic Energy Research Institute, Tokai-mura, Ibaraki 319-1195 Waseda University, Shinjuku-ku, Tokyo 169-8555

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  • Small-Angle Neutron Scattering Study on Ferromagnetic Correlation in (La,Tb)2/3Ca1/3MnO3.

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In order to make clear a correlation between mesoscopic ferromagnetic cluster and the colossal magnetoresistance in perovskite based manganites, the systems (La1-xTbx)2/3Ca1/3MnO3 with x = 0.1 and 0.3 have been studied by small-angle neutron scattering technique. We investigated the property of mesoscopic ferromagnetic (short range ordered) cluster under the various magnetic fields and temperatures. In the sample of x = 0.3, a large number of short range ordered cluster is created below T = 150 K and persists in the two-phase coexistence state down to 8 K. The short range ordered clusters merge into single ferromagnetic domains with applying magnetic field of H = 5 T, resulting in the drop of resistivity of the order of 104. According to our model calculation, we found that roughly 50% of the system remained short range ordered phase at T = 8 K and H = 0 T. The fractional volume of the short range order phase decreased to 18% with applying magnetic field up to H = 1 T.

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