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Layered CMR Manganites: Structure, Properties, and Unconventional Magnetism

Published online by Cambridge University Press:  15 February 2011

J. F. Mitchell ,
D. N. Argyriou ,
C. D. Potter ,
J. D. Jorgensen ,
D. G. Hinks  and
S. D. Bader
J. F. Mitchell
Affiliation:
Materials Science Division, Argonne National Laboratory, 9700 S. Cass Ave., Argonne, Il 60439
D. N. Argyriou
Affiliation:
Materials Science Division, Argonne National Laboratory, 9700 S. Cass Ave., Argonne, Il 60439
C. D. Potter
Affiliation:
Materials Science Division, Argonne National Laboratory, 9700 S. Cass Ave., Argonne, Il 60439
J. D. Jorgensen
Affiliation:
Materials Science Division, Argonne National Laboratory, 9700 S. Cass Ave., Argonne, Il 60439
D. G. Hinks
Affiliation:
Materials Science Division, Argonne National Laboratory, 9700 S. Cass Ave., Argonne, Il 60439
S. D. Bader
Affiliation:
Materials Science Division, Argonne National Laboratory, 9700 S. Cass Ave., Argonne, Il 60439
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Abstract

Neutron powder diffraction studies of the layered compounds R1.2Sr1.8Mn2O7, (R = La,Pr, Nd), RSr2Mn2O7 (R = Pr,Nd),and La1.4Sr1.6Mn2O7 show that the degree of distortion of the MnO6 octahcdra do not correlate with the appearance of a metal-insulator (MI) transition in these compounds. Instead, the in-plane Mn-O bond length appears to be a better indicator of the electronic behavior. Detailed bulk magnetization studies on single crystal La1.2Sr1.8Mn2O7 show thai there are three magnetic regimes as a function of temperature: paramagnetic insulator, short-range ordered (SRO) fcrrromangct, and long-range ordered (LRO) fcrromagnct. Scaling analysis indicates that a 2D finite-size XY model is an appropriate description of the magnetic state in the SRO regime.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 453: Symposium R – Solid State Chemistry of Inorganic Materials , 1996 , 343
Copyright
Copyright © Materials Research Society 1997

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References

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