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Biaxial strain induced electrical inhomogenities and phase separation in the ferromagnetic metallic phase in thin films of La0.7Ca0.3MnO3: A scanning tunneling potentiometry/spectroscopy study.

Published online by Cambridge University Press:  01 February 2011

Mandar Paranjape ,
J. Mitra ,
A. K. Raychaudhuri ,
N. D. Mathur  and
M. G. Blamire
Mandar Paranjape
Affiliation:
Department of Physics, Indian Institute of Science, Bangalore, India 560012.
J. Mitra
Affiliation:
Department of Physics, Indian Institute of Science, Bangalore, India 560012.
A. K. Raychaudhuri
Affiliation:
Department of Physics, Indian Institute of Science, Bangalore, India 560012.
N. D. Mathur
Affiliation:
Department of Materials Science and Metallurgy, University of Cambridge, Cambridge, U.K.CB2 3QZ.
M. G. Blamire
Affiliation:
Department of Materials Science and Metallurgy, University of Cambridge, Cambridge, U.K.CB2 3QZ.
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Abstract

We have investigated the effect of biaxial strain on local electrical/electronic properties in thin films of La0.7Ca0.3MnO3 with varying degrees of biaxial strain in them. The local electrical properties were investigated as a function of temperature by scanning tunneling spectroscopy (STS) and scanning tunneling potentiometry (STP), along with the bulk probe like conductance fluctuations.

The results indicate a positive correlation between the lattice mismatch biaxial strain and the local electrical/electronic inhomogenities observed in the strained sample. This is plausible since the crystal structure of the manganites interfere rather strongly with the magnetic/electronic degrees of freedom. Thus even a small imbalance (biaxial strain) can induce significant changes in the electrical properties of the system.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 838: Symposium O – Scanning Probe and Other Novel Microscopies of Local Phenomena in Nanostructured Materials , 2004 , O1.2
Copyright
Copyright © Materials Research Society 2005

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References

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