Abstract
We have found persistent and bidirectional x-ray photoinduced phase transition (PIPT) between the charge-orbital ordered and the ferromagnetic phase in a few percent Fe-doped layered manganite La${}_{0.5}$Sr${}_{1.5}$Mn${}_{1\ensuremath{-}x}$Fe${}_{x}$O${}_{4}$. Although partial x-ray PIPT has been observed in undoped manganite as well, the photoinduced effect has been confirmed to be much enhanced by impurity doping. The partial substitution of Mn ions with Fe ions was found to suppress the long-range charge-orbital order and to form a phase-separated ground state between the charge-orbital ordered and the ferromagnetic phases. Such bi-stability arising from competing phases plays an essential role in persistent and reversible PIPT phenomena.
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