Small Angle Neutron Scattering Study on Pr0.7Ca0.3MnO3. Evidence of Two-Phase Coexistence.

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  • Yamada Yasusada
    Advanced Research Institute for Science and Engineering, Waseda University, Okubo, Shinjuku-ku, Tokyo 169-0072
  • Iwase Takeshi
    Advanced Research Institute for Science and Engineering, Waseda University, Okubo, Shinjuku-ku, Tokyo 169-0072
  • Watahiki Masaya
    Advanced Science Reseach Center, Japan Atomic Energy Reseach Institute, Tokai, Ibaraki 319-1195
  • Suzuki Jun-ichi
    Advanced Science Reseach Center, Japan Atomic Energy Reseach Institute, Tokai, Ibaraki 319-1195

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  • Small Angle Neutron Scattering Study on Pr<sub>0.7</sub>Ca<sub>0.3</sub>MnO<sub>3</sub>–Evidence of Two-Phase Coexistence–

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We observed small angle neutron scattering in Pr0.7Ca0.3MnO3 under two different magnetic fields, H = 0 and H = 1 T, focusing our attention on the lower angle region where the SANS spectra clearly show Porod-type Q-dependence. It is found that under ZFC (zero field cooling) condition, the system at low temperatures is in the state of `two-phase coexistence' where FM (ferromagnetic metallic) microcluster with the average radius of R ∼ 17 nm are embedded on AFI (antiferromagnetic insulater) background. Upon application of magnetic field, the ferromagnetic clusters start to coalesque to form macroscopic domains with the size of order of 2 μm without changing the total volume of FM region appreciablly. These conclusions seem to provide rather clear picture for CMR effect in Pr0.7Ca0.3MnO3 as viewed from macroscopic standpoints.

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