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Kinetically stable glassy phase formation in neodymium nickelate thin films as evidenced by Hall effect and electrical resistivity measurements

Published online by Cambridge University Press:  10 April 2013

Megan Campbell Prestgard  and
Ashutosh Tiwari
Megan Campbell Prestgard
Affiliation:
Nanostructured Materials Research Laboratory, Department of Materials Science and Engineering, University of Utah, Salt Lake City, Utah 84112
Ashutosh Tiwari*
Affiliation:
Nanostructured Materials Research Laboratory, Department of Materials Science and Engineering, University of Utah, Salt Lake City, Utah 84112
*
a)Address all correspondence to this author. e-mail: tiwari@eng.utah.edu
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Abstract

In this study, we are reporting the time- and temperature-dependence of the electrical resistivity and temperature-dependence of the Hall voltage in neodymium nickelate thin films. The films were deposited on a lanthanum aluminate substrate [LaAlO3 (001)] by a pulsed laser deposition technique, with thicknesses ranging from 0.6 to 120 nm. Time-dependent electrical transport measurements indicated the formation of a kinetically stable metallic glassy phase rather than a stable insulating phase on cooling below the transition temperature, TM-I. Comparisons of the low-temperature behavior with that of common insulators further supported this claim. Hall effect measurements on the 1.2-nm sample showed a local maximum in the carrier concentration just below the TM-I on both the heating and cooling cycles. This again confirmed the proposed low-temperature structure, in that, for the 1.2-nm sample, there was a minimal degree of supercooling before transitioning to a kinetically stable glassy phase.

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Articles
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Journal of Materials Research , Volume 28 , Issue 13: FOCUS ISSUE: Frontiers in Thin-Film Epitaxy and Nanostructured Materials , 14 July 2013 , pp. 1699 - 1706
Copyright
Copyright © Materials Research Society 2013 

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