Structural evolution and electronic properties of La1+xSr2-xMn2O7

Seshadri, R and Martin, C and Hervieu, M and Raveau, B and Rao, CNR (1997) Structural evolution and electronic properties of La1+xSr2-xMn2O7. In: Chemistry of Materials, 9 (1). pp. 270-277.

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Abstract

A detailed study of the layered manganite La1+xSr2-xMn2O7 has been performed, establishing that within the composition range 0.1 less than or equal to x less than or equal to 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)(2)Mn2O6 units, is characterized by a reluctance to deform the latter. This manifests as a ''pumping'' of the larger Sr-II 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:	Journal Article
Additional Information:	Copyright of this article belongs to American Chemical Society.
Department/Centre:	Division of Chemical Sciences > Solid State & Structural Chemistry Unit
Date Deposited:	24 Jun 2011 05:38
Last Modified:	24 Jun 2011 05:38
URI:	http://eprints.iisc.ernet.in/id/eprint/38491

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