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X-Ray Induced Insulator-Metal Transitions in CMR Manganites

Published online by Cambridge University Press:  10 February 2011

V. Kiryukhin ,
D. Casa ,
B. Keimer ,
J. P. Hill ,
A. Vigliante ,
Y. Tomioka  and
Y. Tokura
V. Kiryukhin
Affiliation:
Dept. of Physics, Princeton University, Princeton, NJ 08544
D. Casa
Affiliation:
Dept. of Physics, Princeton University, Princeton, NJ 08544
B. Keimer
Affiliation:
Dept. of Physics, Princeton University, Princeton, NJ 08544
J. P. Hill
Affiliation:
Dept. of Physics, Brookhaven National Laboratory, Upton, NY 11973
A. Vigliante
Affiliation:
Dept. of Physics, Brookhaven National Laboratory, Upton, NY 11973
Y. Tomioka
Affiliation:
Joint Research Center for Atom Technology (JRCAT), Tsukuba, Ibaraki 305, Japan
Y. Tokura
Affiliation:
Joint Research Center for Atom Technology (JRCAT), Tsukuba, Ibaraki 305, Japan Dept. of Applyed Physics, University of Tokyo, Tokyo 113, Japan
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Abstract

In this work we report a study of the photoinduced insulator-to-metal transition in manganese oxide perovskites of the formula Pr1-xCaxMnO3. The transition is closely related to the magnetic field induced insulator-to-metal transition (CMR effect) observed in these materials. It is accompanied by a dramatic change in the magnetic properties and lattice structure: the material changes from an insulating charge-ordered canted antiferromagnet to a ferromagnetic metal. We present an investigation of the transport and structural properties of these materials over the course of the transition (which usually takes about an hour to complete). The current-voltage characteristics exhibited by the material during the transition are highly nonlinear, indicating a large inhomogeneity of the transitional state. Possible practical applications of this novel type of transition are briefly discussed. We also report a high-resolution x-ray diffraction study of the charge-ordering in these materials. The temperature dependent charge ordering structure observed in these compounds is more complex than previously reported.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 494: Symposium V – Science & Technology of Magnetic Oxides , 1997 , 65
Copyright
Copyright © Materials Research Society 1998

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References

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