Prediction and Experimental Evidence for Thermodynamically Stable Charged Orbital Domain Walls
Abstract
On theoretical grounds, we show that orbital domain walls (ODWs), which are known to exist in the charge and orbital ordered layered manganite LaSr2Mn2O7, should be partially charged as a result of competition between orbital-induced strain and Coulomb repulsion. Furthermore, this unexpected result provides the necessary condition for the known thermodynamic stability of these ODWs, which are unlike the more typical domain walls that arise only from an external field. We offer experimental data consistent with this theoretical framework through a combined transport and x-ray-diffraction study. In particular, our transport data on this charge and orbital ordered manganite exhibit abrupt transformations to higher conductance at a threshold electric field. As transport phenomena closely resemble effects found for sliding charge-density waves (SCDWs) in pseudo-one-dimensional (1D) materials, a SCDW along such pseudo-1D ODWs provides a natural explanation of our data. Importantly, x-ray-diffraction data eliminate heating and melting of charge order as tenable alternative explanations of our data.
- Authors:
- Publication Date:
- Research Org.:
- Argonne National Laboratory (ANL), Argonne, IL (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Basic Energy Sciences (BES)
- OSTI Identifier:
- 1181228
- Alternate Identifier(s):
- OSTI ID: 1395112
- Grant/Contract Number:
- AC02-06CH11357; AC02-98CH10886
- Resource Type:
- Published Article
- Journal Name:
- Physical Review X
- Additional Journal Information:
- Journal Name: Physical Review X Journal Volume: 4 Journal Issue: 3; Journal ID: ISSN 2160-3308
- Publisher:
- American Physical Society
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY
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. https://doi.org/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. Mon .
"Prediction and Experimental Evidence for Thermodynamically Stable Charged Orbital Domain Walls". United States. https://doi.org/10.1103/PhysRevX.4.031028.
@article{osti_1181228,
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 = {On theoretical grounds, we show that orbital domain walls (ODWs), which are known to exist in the charge and orbital ordered layered manganite LaSr2Mn2O7, should be partially charged as a result of competition between orbital-induced strain and Coulomb repulsion. Furthermore, this unexpected result provides the necessary condition for the known thermodynamic stability of these ODWs, which are unlike the more typical domain walls that arise only from an external field. We offer experimental data consistent with this theoretical framework through a combined transport and x-ray-diffraction study. In particular, our transport data on this charge and orbital ordered manganite exhibit abrupt transformations to higher conductance at a threshold electric field. As transport phenomena closely resemble effects found for sliding charge-density waves (SCDWs) in pseudo-one-dimensional (1D) materials, a SCDW along such pseudo-1D ODWs provides a natural explanation of our data. Importantly, x-ray-diffraction data eliminate heating and melting of charge order as tenable alternative explanations of our data.},
doi = {10.1103/PhysRevX.4.031028},
journal = {Physical Review X},
number = 3,
volume = 4,
place = {United States},
year = {Mon Aug 18 00:00:00 EDT 2014},
month = {Mon Aug 18 00:00:00 EDT 2014}
}
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https://doi.org/10.1103/PhysRevX.4.031028
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