Structural evolution and electronic properties of La1+xSr2−xMn2O7

Seshadri, R. ; Martin, C. ; Hervieu, M. ; Raveau, B. ; Rao, C. N. R. (1997) Structural evolution and electronic properties of La1+xSr2−xMn2O7 Chemistry of Materials, 9 (1). pp. 270-277. ISSN 0897-4756

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A detailed study of the layered manganite La1+xSr2−xMn2O7 has been performed, establishing that within the composition range 0.1 ≤ x ≤ 0.45 the phases crystallize in the I4/mmm space group. The evolution of structural parameters with x in this composition range has been followed using a novel application of an existing program for the Rietveld analysis of powder diffraction data. The structure, a familiar intergrowth of rock-salt (La,Sr)O slabs and double perovskite (La,Sr)2Mn2O6 units, is characterized by a reluctance to deform the latter. This manifests as a "pumping" of the larger SrII ion into the 12-coordinate site of the structure as x is increased. We report these features of the structure as well as electrical transport and magnetic properties, in light of recent observations of giant, negative magnetoresistance in these systems.

Item Type:Article
Source:Copyright of this article belongs to American Chemical Society.
ID Code:40000
Deposited On:21 May 2011 06:00
Last Modified:21 May 2011 06:00

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