Abstract
A new type of charge ordering stable up to T 1 500 K has been evidenced by electron microscopy in the Mn 3+ -rich perovskite Bi 2/3 Sr 1/3 MnO 3 . This new superstructure, based on a Imma-type subcell is characterized by a double modulation with a = 2a p √2, b = 4a p , c = a p √2. X-ray powder diffraction evidences a second structural transition at T 2 580 K and suggests a displacive modulation of the oxygen atoms below T 2 . These results are interpreted as the correlated coexistence of charge-orbital ordering and modulated displacive ordering of oxygen atoms, in the form of double Mn stripes, below 500 K.
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