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The transition between a ferromagnetic metal and an insulator with short-range charge/orbital correlation has been investigated for the manganites R0.55Sr0.45MnO₃ [R=Sm, Eu, Gd, and Sm_1-yGdy $(0<~y<~1)]$. The phase diagram as a function of the averaged radius of perovskite A-site cations is entirely modified from the prototypical bicritical phase diagram, e.g., for Pr0.55(Ca_1-ySry)0.45MnO₃ with the competition between the ferromagnetic metal and charge/orbital-ordered insulator. Larger randomness via the local lattice distortion in R0.55Sr0.45MnO₃ enhances the phase fluctuation between ferromagnetic metal and charge/orbital-ordered insulator and suppresses their long-range orders.
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Tomioka et al. (2003) studied this question.
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