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Evidence for a Jahn-Teller Distortion in the CMR Layered Manganite La1.4Sr1.6Mn2O7

Published online by Cambridge University Press:  10 February 2011

Despina Louca ,
G. H. Kwei  and
J. F. Mitchell
Despina Louca
Affiliation:
Los Alamos National Laboratory, Los Alamos, NM 87545
G. H. Kwei
Affiliation:
Los Alamos National Laboratory, Los Alamos, NM 87545
J. F. Mitchell
Affiliation:
Argonne National Laboratory, Argonne, IL 60439
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Abstract

The changes with temperature in the crystallographic structure of the two-layered La1.4Sr1.6Mn2O7, are on average quite small but the atomic pair density function analysis of pulsed neutron diffraction data shows that the lattice is locally distorted in accordance with the change in the transport properties. In particular, while no Jahn-Teller (JT) distortion is expected in the layered compounds because the octahedral bilayers are almost cubic, lattice distortions attributed to a large JT effect are present and are of comparable magnitude as in the cubic perovskite system. This could in turn explain the similarity in their properties. The number of the JT distorted sites is reduced with temperature concomitantly with the decrease in resistivity of the ab-plane.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 494: Symposium V – Science & Technology of Magnetic Oxides , 1997 , 53
Copyright
Copyright © Materials Research Society 1998

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