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Room temperature Mn K-edge extended x-ray absorption fine structure (EXAFS)studies were carried out on La$_{1-x}$Sr$_x$MnO$_{3+\delta}$ (x = 0.1 to 0.9)compounds. It is found from the detailed EXAFS analysis that the localstructure around Mn sites is different from the global structure inferred fromx-ray diffraction, especially for x <= 0.4, indicating presence of localdistortions in MnO$_6$ octahedra. For the rhombohedral compounds, x = 0.1 to0.3 the distortion is maximum for x = 0.1 and two bond lengths are seen- shortone in basal plane and long one in apical plane. For compounds with x = 0.4 to0.8 two short bonds in basal plane and four long bonds- two in the basal planeand remaining two in the apical plane are seen. For the compounds up to x = 0.3compositions long bond length decreases and short bond length increases withincrease in x whereas for the compounds 0.4 <= x <= 0.8 both types of bondlengths decrease. Such behaviour of bond lengths is an indication of thechanged nature of distortion from Jahn-Teller type to breathing type at x = 0.4composition.Comment: 16 pages, 1 table, 8 figure

journal of physics. condensed matter

Local distortion of MnO6octahedron in La1−xSrxMnO3+δ(x= 0.1–0.9): an EXAFS study