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Title: Prediction and Experimental Evidence for Thermodynamically Stable Charged Orbital Domain Walls

Abstract

The quest for miniaturization is prevalent in many fields of modern science and technology. The ultimate limit for conduction would be a one-dimensional (1D) chain of atoms and, for example, carbon nanotubes are a notable approximation to this ideal. Here we present strong evidence for an unexpected phenomenon—a sliding charge-density wave along pseudo-1D, atomically homogeneous orbital domain walls (ODWs) in insulating bilayer manganite crystals. At a threshold electric field, crystals exhibit abrupt transformations to higher conductance, while x-ray diffraction confirms that these are not due to heating or melting of charge order. The conductance data resemble those of well-known pseudo-1D sliding-charge-density waves, in particular the presence of a depinning voltage. The vital link is our theoretical insight that ODWs must be partially charged due to competition between orbital-induced strain and Coulomb repulsion. The ideas found here embody a new principle for creating ultra-nano conductive paths in other materials and devices.

Authors:
; ; ; ; ; ;
Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Org.:
USDOE Office of Science - Office of Basic Energy Sciences - Materials Sciences and Engineering Division
OSTI Identifier:
1357053
DOE Contract Number:  
AC02-06CH11357
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physical Review. X; Journal Volume: 4; Journal Issue: 3
Country of Publication:
United States
Language:
English

Citation Formats

Li, Qing’an, Gray, K. E., Wilkins, S. B., Garcia Fernandez, M., Rosenkranz, S., Zheng, H., and Mitchell, J. F. Prediction and Experimental Evidence for Thermodynamically Stable Charged Orbital Domain Walls. United States: N. p., 2014. Web. doi:10.1103/PhysRevX.4.031028.
Li, Qing’an, Gray, K. E., Wilkins, S. B., Garcia Fernandez, M., Rosenkranz, S., Zheng, H., & Mitchell, J. F. Prediction and Experimental Evidence for Thermodynamically Stable Charged Orbital Domain Walls. United States. doi:10.1103/PhysRevX.4.031028.
Li, Qing’an, Gray, K. E., Wilkins, S. B., Garcia Fernandez, M., Rosenkranz, S., Zheng, H., and Mitchell, J. F. Fri . "Prediction and Experimental Evidence for Thermodynamically Stable Charged Orbital Domain Walls". United States. doi:10.1103/PhysRevX.4.031028.
@article{osti_1357053,
title = {Prediction and Experimental Evidence for Thermodynamically Stable Charged Orbital Domain Walls},
author = {Li, Qing’an and Gray, K. E. and Wilkins, S. B. and Garcia Fernandez, M. and Rosenkranz, S. and Zheng, H. and Mitchell, J. F.},
abstractNote = {The quest for miniaturization is prevalent in many fields of modern science and technology. The ultimate limit for conduction would be a one-dimensional (1D) chain of atoms and, for example, carbon nanotubes are a notable approximation to this ideal. Here we present strong evidence for an unexpected phenomenon—a sliding charge-density wave along pseudo-1D, atomically homogeneous orbital domain walls (ODWs) in insulating bilayer manganite crystals. At a threshold electric field, crystals exhibit abrupt transformations to higher conductance, while x-ray diffraction confirms that these are not due to heating or melting of charge order. The conductance data resemble those of well-known pseudo-1D sliding-charge-density waves, in particular the presence of a depinning voltage. The vital link is our theoretical insight that ODWs must be partially charged due to competition between orbital-induced strain and Coulomb repulsion. The ideas found here embody a new principle for creating ultra-nano conductive paths in other materials and devices.},
doi = {10.1103/PhysRevX.4.031028},
journal = {Physical Review. X},
number = 3,
volume = 4,
place = {United States},
year = {Fri Aug 01 00:00:00 EDT 2014},
month = {Fri Aug 01 00:00:00 EDT 2014}
}