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Photo-modulated dynamic competition between metallic and insulating phases in a layered manganite

Published online by Cambridge University Press:  09 January 2014

Yuelin Li ,
Donald Walko ,
Qing’an Li ,
Yaohua Liu ,
Stephan Rosenkranz ,
Hong Zheng ,
J. F Mitchell ,
Haidan Wen ,
Eric Dufresne  and
Bernhard Adams
Yuelin Li*
Affiliation:
X-ray Science Division, Argonne National Laboratory, Argonne, Illinois 60439, USA
Donald Walko
Affiliation:
X-ray Science Division, Argonne National Laboratory, Argonne, Illinois 60439, USA
Qing’an Li
Affiliation:
Material Science Division, Argonne National Laboratory, Argonne, Illinois 60439, USA
Yaohua Liu
Affiliation:
Material Science Division, Argonne National Laboratory, Argonne, Illinois 60439, USA
Stephan Rosenkranz
Affiliation:
Material Science Division, Argonne National Laboratory, Argonne, Illinois 60439, USA
Hong Zheng
Affiliation:
Material Science Division, Argonne National Laboratory, Argonne, Illinois 60439, USA
J. F Mitchell
Affiliation:
Material Science Division, Argonne National Laboratory, Argonne, Illinois 60439, USA
Haidan Wen
Affiliation:
X-ray Science Division, Argonne National Laboratory, Argonne, Illinois 60439, USA
Eric Dufresne
Affiliation:
X-ray Science Division, Argonne National Laboratory, Argonne, Illinois 60439, USA
Bernhard Adams
Affiliation:
X-ray Science Division, Argonne National Laboratory, Argonne, Illinois 60439, USA
*
*[email protected]
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Abstract

We show evidence that the competition between the antiferromagnetic metallic phase and the charge- and orbital-ordered insulating phase at the reentrant phase boundary of a layered manganite, LaSr2Mn2O7, can be manipulated using ultrafast optical excitation. The time-dependent evolution of the Jahn-Teller superlattice reflection, the indicator of the formation of charge and orbital order, was measured at different laser fluences. The laser-induced change in the Jahn-Teller reflection intensity shows a reversal of sign between earlier (∼10 ns) and later (∼150 ns) times during the relaxation of the sample. This is consistent with a physics picture whereby the laser excitation modulates the local competition between the metallic and the insulating phases.

Keywords

phase transformationx-ray diffraction (XRD)metal-insulator transition
Type
Articles
Information
MRS Online Proceedings Library (OPL) , Volume 1636: Symposium U – Adaptive Soft Matter through Molecular Networks , 2014 , mrsf13-1636-u6.09
Copyright
Copyright © Materials Research Society 2014 

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