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Title: Far-infrared and dc-Magnetotransport of CaMnO3 CaRuO3 Superlattices

Abstract

We report temperature- and magnetic-field-dependent measurements of the dc resistivity and the far-infrared reflectivity (FIR) (photon energies {h_bar}{omega} = 50-700 cm{sup -1}) of superlattices comprising ten consecutive unit cells of the antiferromagnetic insulator CaMnO{sub 3}, and four to ten unit cells of the correlated paramagnetic metal CaRuO{sub 3}. Below the Neel temperature of CaMnO{sub 3}, the dc resistivity exhibits a logarithmic divergence upon cooling, which is associated with a large negative, isotropic magnetoresistance. The {omega} {yields} 0 extrapolation of the resistivity extracted from the FIR reflectivity, on the other hand, shows a much weaker temperature and field dependence. We attribute this behavior to scattering of itinerant charge carriers in CaRuO{sub 3} from sparse, spatially isolated magnetic defects at the CaMnO{sub 3}-CaRuO{sub 3} interfaces. This field-tunable 'transport bottleneck' effect may prove useful for functional metal-oxide devices.

Authors:
 [1];  [1];  [2];  [3];  [4];  [5];  [1]
  1. Max-Planck-Institut fur Feskorperforschung, Stuttgart, Germany
  2. Argonne National Laboratory (ANL)
  3. University of Illinois, Chicago
  4. University of Arkansas
  5. ORNL
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
1042814
DOE Contract Number:  
DE-AC05-00OR22725
Resource Type:
Journal Article
Journal Name:
Physical Review B
Additional Journal Information:
Journal Volume: 84; Journal Issue: 4; Journal ID: ISSN 1098-0121
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; CHARGE CARRIERS; DEFECTS; EXTRAPOLATION; FUNCTIONALS; MAGNETORESISTANCE; NEEL TEMPERATURE; REFLECTIVITY; SCATTERING; SUPERLATTICES; TRANSPORT

Citation Formats

Yordanov, P., Boris, A. V., Freeland, J. W., Kavich, J. J., Chakhalian, J., Lee, Ho Nyung, and Keimer, Bernhard. Far-infrared and dc-Magnetotransport of CaMnO3 CaRuO3 Superlattices. United States: N. p., 2012. Web.
Yordanov, P., Boris, A. V., Freeland, J. W., Kavich, J. J., Chakhalian, J., Lee, Ho Nyung, & Keimer, Bernhard. Far-infrared and dc-Magnetotransport of CaMnO3 CaRuO3 Superlattices. United States.
Yordanov, P., Boris, A. V., Freeland, J. W., Kavich, J. J., Chakhalian, J., Lee, Ho Nyung, and Keimer, Bernhard. 2012. "Far-infrared and dc-Magnetotransport of CaMnO3 CaRuO3 Superlattices". United States.
@article{osti_1042814,
title = {Far-infrared and dc-Magnetotransport of CaMnO3 CaRuO3 Superlattices},
author = {Yordanov, P. and Boris, A. V. and Freeland, J. W. and Kavich, J. J. and Chakhalian, J. and Lee, Ho Nyung and Keimer, Bernhard},
abstractNote = {We report temperature- and magnetic-field-dependent measurements of the dc resistivity and the far-infrared reflectivity (FIR) (photon energies {h_bar}{omega} = 50-700 cm{sup -1}) of superlattices comprising ten consecutive unit cells of the antiferromagnetic insulator CaMnO{sub 3}, and four to ten unit cells of the correlated paramagnetic metal CaRuO{sub 3}. Below the Neel temperature of CaMnO{sub 3}, the dc resistivity exhibits a logarithmic divergence upon cooling, which is associated with a large negative, isotropic magnetoresistance. The {omega} {yields} 0 extrapolation of the resistivity extracted from the FIR reflectivity, on the other hand, shows a much weaker temperature and field dependence. We attribute this behavior to scattering of itinerant charge carriers in CaRuO{sub 3} from sparse, spatially isolated magnetic defects at the CaMnO{sub 3}-CaRuO{sub 3} interfaces. This field-tunable 'transport bottleneck' effect may prove useful for functional metal-oxide devices.},
doi = {},
url = {https://www.osti.gov/biblio/1042814}, journal = {Physical Review B},
issn = {1098-0121},
number = 4,
volume = 84,
place = {United States},
year = {Sun Jan 01 00:00:00 EST 2012},
month = {Sun Jan 01 00:00:00 EST 2012}
}