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Local Crystal Structure Modifications in Pulsed Laser Deposited Colossal Magnetoresistive Oxide Thin Films

Published online by Cambridge University Press:  15 March 2011

M. Alper Sahiner ,
Wiqar Shah ,
Marc Aranguren ,
Jeffrey Serfass  and
Joseph C. Woicik
M. Alper Sahiner
Affiliation:
Seton Hall University, Physics Department, South Orange, New Jersey 07079
Wiqar Shah
Affiliation:
Seton Hall University, Physics Department, South Orange, New Jersey 07079
Marc Aranguren
Affiliation:
Seton Hall University, Physics Department, South Orange, New Jersey 07079
Jeffrey Serfass
Affiliation:
Seton Hall University, Physics Department, South Orange, New Jersey 07079
Joseph C. Woicik
Affiliation:
National Institute of Standards and Technology, Gaithersburg, Maryland 20899, USA
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Abstract

The local structure around the manganese atom is probed by extended x-ray absorption spectroscopy (EXAFS) measurements in pulsed laser deposited thin films of La11xCaxMnO3 (x=0.1210.53). The thin films were deposited on various single crystal oxide substrates. The effect of the lattice parameter of the substrate on the local structural modifications around Mn atom is investigated. All the x-ray absorption experiments were performed at the National Synchrotron Light Source of Brookhaven National Laboratory. By detailed EXAFS theoretical modeling for the possible local structures and the least square fitting to the EXAFS data using these models, the overall substrate and the Ca concentration effects are probed. The EXAFS results indicate a rigid Mn-O bonding, but response of the Mn-O-Mn bond angle upon variations of the substrate lattice constant and Ca substitution.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1118: Symposium K – Magnetic Nanostructures by Design , 2008 , 1118-K05-06
Copyright
Copyright © Materials Research Society 2009

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References

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