Giant Discrete Steps in Metal-Insulator Transition in Perovskite Manganite Wires

Hong-Ying Zhai, J. X. Ma, D. T. Gillaspie, X. G. Zhang, T. Z. Ward, E. W. Plummer, and J. Shen
Phys. Rev. Lett. 97, 167201 – Published 17 October 2006

Abstract

Optical lithography is used to fabricate LPCMO wires starting from a single (La5/80.3Pr0.3)Ca3/8MnO3 (LPCMO) film epitaxially grown on a LaAlO3(100) substrate. As the width of the wires is decreased, the resistivity of the LPCMO wires exhibits giant and ultrasharp steps upon varying temperature and magnetic field in the vicinity of the metal-insulator transition. The origin of the ultrasharp transitions is attributed to the effect of spatial confinement on the percolative transport in manganites.

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  • Received 1 August 2006

DOI:https://doi.org/10.1103/PhysRevLett.97.167201

©2006 American Physical Society

Authors & Affiliations

Hong-Ying Zhai1, J. X. Ma1,3, D. T. Gillaspie1,3, X. G. Zhang2,4, T. Z. Ward1,3, E. W. Plummer1,2,3, and J. Shen1,2,3,*

  • 1Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
  • 2Center for Nanophase Materials Science Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
  • 3Department of Physics and Astronomy, The University of Tennessee, Knoxville, Tennessee 37996, USA
  • 4Computer Science and Mathematics Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA

  • *Corresponding author. Email address: shenj@ornl.gov

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Vol. 97, Iss. 16 — 20 October 2006

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