Local distortion of MnO$_6$ octahedron in La$_{1-x}$Sr$_x$MnO$_{3+δ}$ (x = 0.1 to 0.9): an EXAFS study

R. Bindu; S. K. Pandey; Ashwani Kumar; S. Khalid; A. V. Pimpale

doi:10.1088/0953-8984/17/41/010

paper

Local distortion of MnO $_{6}$ octahedron in La $_{1 - x}$ Sr $_{x}$ MnO $_{3 + δ}$ (x = 0.1 to 0.9): an EXAFS study

arXiv:cond-mat/0601117 · doi:10.1088/0953-8984/17/41/010

Abstract

Room temperature Mn K-edge extended x-ray absorption fine structure (EXAFS) studies were carried out on La $_{1 - x}$ Sr $_{x}$ MnO $_{3 + δ}$ (x = 0.1 to 0.9) compounds. It is found from the detailed EXAFS analysis that the local structure around Mn sites is different from the global structure inferred from x-ray diffraction, especially for x <= 0.4, indicating presence of local distortions in MnO $_{6}$ octahedra. For the rhombohedral compounds, x = 0.1 to 0.3 the distortion is maximum for x = 0.1 and two bond lengths are seen- short one in basal plane and long one in apical plane. For compounds with x = 0.4 to 0.8 two short bonds in basal plane and four long bonds- two in the basal plane and remaining two in the apical plane are seen. For the compounds up to x = 0.3 compositions long bond length decreases and short bond length increases with increase in x whereas for the compounds 0.4 <= x <= 0.8 both types of bond lengths decrease. Such behaviour of bond lengths is an indication of the changed nature of distortion from Jahn-Teller type to breathing type at x = 0.4 composition.

16 pages, 1 table, 8 figures

Local distortion of MnO $_{6}$ octahedron in La $_{1 - x}$ Sr $_{x}$ MnO $_{3 + δ}$ (x = 0.1 to 0.9): an EXAFS study

Abstract

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Cited by in corpus (7)

Local distortion of MnO6​ octahedron in La1−x​Srx​MnO3+δ​ (x = 0.1 to 0.9): an EXAFS study

Abstract

References in corpus (5)

Cited by in corpus (7)

Local distortion of MnO $_{6}$ octahedron in La $_{1 - x}$ Sr $_{x}$ MnO $_{3 + δ}$ (x = 0.1 to 0.9): an EXAFS study