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The Effect of Radiation Induced Disorder on La0.7Ca0.3MnO3–δ Thin Films

Published online by Cambridge University Press:  10 February 2011

R. M. Stroud ,
V. M. Browning ,
J. M. Byers ,
D. B. Chrisey ,
W. W. Fuller-Mora ,
K. S. Grabowski ,
J. S. Horwitz ,
J. Kim ,
D. L. Knies  and
M. S. Osofsky
R. M. Stroud
Affiliation:
Naval Research Lab., 4555 Overlook Ave. SW, Washington, DC 20375
V. M. Browning
Affiliation:
Naval Research Lab., 4555 Overlook Ave. SW, Washington, DC 20375
J. M. Byers
Affiliation:
Naval Research Lab., 4555 Overlook Ave. SW, Washington, DC 20375
D. B. Chrisey
Affiliation:
Naval Research Lab., 4555 Overlook Ave. SW, Washington, DC 20375
W. W. Fuller-Mora
Affiliation:
Naval Research Lab., 4555 Overlook Ave. SW, Washington, DC 20375
K. S. Grabowski
Affiliation:
Naval Research Lab., 4555 Overlook Ave. SW, Washington, DC 20375
J. S. Horwitz
Affiliation:
Naval Research Lab., 4555 Overlook Ave. SW, Washington, DC 20375
J. Kim
Affiliation:
Naval Research Lab., 4555 Overlook Ave. SW, Washington, DC 20375
D. L. Knies
Affiliation:
Naval Research Lab., 4555 Overlook Ave. SW, Washington, DC 20375
M. S. Osofsky
Affiliation:
Naval Research Lab., 4555 Overlook Ave. SW, Washington, DC 20375
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Abstract

The effects of disorder on the transport and magnetic properties of pulsed laser deposited La0.7Ca0.3MnO3 thin films were studied. Ion irradiation with 10 MeV I and 6 MeV Si ions was used to produce controlled levels of defects ranging from 0.006 to 0.024 displacements per atom. The peak resistance temperature of the I-irradiated films decreased from 264K for the undamaged film to OK for the 0.016 dpa film. The magnetic ordering temperature decreased from 270K (undamaged) to 130K (0.011 dpa), and remained nearly constant at 130K for higher damage levels. This demonstrates a decoupling of the magnetic and metal-insulator transitions. A characteristic relationship between the peak resistance temperature and activation energy of resistance with the form Tp = 285(1-Δρ/115)0.13, was observed for all films. This characteristic relationship indicates that the range of resistivity and magnetoresistivity values for observed La0.7Ca0.3MnO3 can be explained in terms of disorder-limited polaron hopping.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 494: Symposium V – Science & Technology of Magnetic Oxides , 1997 , 287
Copyright
Copyright © Materials Research Society 1998

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References

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