Abstract
The electron microscopy study of the manganites Bi1-xSrxMnO3, especially for x = 1/2 and x = 2/3, has allowed a new type of modulated structure, correlated to charge ordering (CO) phenomena, to be evidenced. The Bi1-xSrxMnO3 manganites are characterized by a modulated structure, the modulation vector being qa* (q ≈ 1 − x), and the I-type symmetry of the perovskite subcell. A model is proposed: the structure can be described by double Mn3+ stripes alternating with double (x = 1/2) or with quadruple (x = 2/3) Mn4+ stripes. This type of ordering, observed at room temperature (RT), is compared to that observed in the manganites Ln1-xCaxMnO3 at low temperature and in Bi1-xCaxMnO3 at RT. The absence of magnetoresistance up to 7T suggests that the CO state of Bi0.5Sr0.5MnO3 is exceptionally stable, with a very high TCO close to 500 K. The electron diffraction study carried out versus T shows that the superstructure disappears at 500 K and that the phenomenon is reversible.
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