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Title: Crossover between weak anti-localization and weak localization by Co doping and annealing in gapless PbPdO{sub 2} and spin gapless Co-doped PbPdO{sub 2}

Abstract

The magnetotransport properties of Pb(Pd,Co)O{sub 2} and PbPdO{sub 2} thin films were investigated. In magnetoconductance curves, we observed a crossover between weak anti-localization (WAL) and weak localization (WL) depending on the annealing and Co doping in PbPdO{sub 2} thin films. For the Pb(Pd,Co)O{sub 2} case showing WAL signals, the ex-situ annealing weakens the Pd-O hybridization by stabilizing Co{sup 3+} states and generating Pd{sup 1+} states, instead of Pd{sup 2+}, so that the spin-orbit coupling (SOC) strength is significantly reduced. It causes the dominant magnetotransport mechanism change from WAL to WL. This annealing effect is compared with the PbPdO{sub 2} case, which possesses WL signals. The annealing process stabilizes the oxygen states and enhances the Pd-O hybridization, and consequently the SOC strength is enhanced. Our experimental results are well explained by the Hikami-Larkin-Nagaoka theory in terms of two important physical parameters; SOC strength-related α and inelastic scattering length l{sub ϕ}.

Authors:
; ; ; ;  [1];  [2];  [3]
  1. Department of Physics, Sogang University, Seoul 121-742 (Korea, Republic of)
  2. Department of Electrical and Computer Engineering and NUSNNI, National University of Singapore, Singapore 117576 (Singapore)
  3. Department of Physics, Inha University, Incheon 402-751 (Korea, Republic of)
Publication Date:
OSTI Identifier:
22398967
Resource Type:
Journal Article
Journal Name:
Applied Physics Letters
Additional Journal Information:
Journal Volume: 106; Journal Issue: 17; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0003-6951
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; ANNEALING; COBALT IONS; COMPARATIVE EVALUATIONS; DIAGRAMS; DOPED MATERIALS; INELASTIC SCATTERING; LEAD COMPOUNDS; L-S COUPLING; MAGNETORESISTANCE; OXYGEN; PALLADIUM IONS; PALLADIUM OXIDES; SPIN; THIN FILMS

Citation Formats

Choo, S. M., Lee, K. J., Park, S. M., Park, G. S., Jung, M. H., E-mail: mhjung@sogang.ac.kr, Yoon, J. B., and You, C.-Y. Crossover between weak anti-localization and weak localization by Co doping and annealing in gapless PbPdO{sub 2} and spin gapless Co-doped PbPdO{sub 2}. United States: N. p., 2015. Web. doi:10.1063/1.4919452.
Choo, S. M., Lee, K. J., Park, S. M., Park, G. S., Jung, M. H., E-mail: mhjung@sogang.ac.kr, Yoon, J. B., & You, C.-Y. Crossover between weak anti-localization and weak localization by Co doping and annealing in gapless PbPdO{sub 2} and spin gapless Co-doped PbPdO{sub 2}. United States. doi:10.1063/1.4919452.
Choo, S. M., Lee, K. J., Park, S. M., Park, G. S., Jung, M. H., E-mail: mhjung@sogang.ac.kr, Yoon, J. B., and You, C.-Y. Mon . "Crossover between weak anti-localization and weak localization by Co doping and annealing in gapless PbPdO{sub 2} and spin gapless Co-doped PbPdO{sub 2}". United States. doi:10.1063/1.4919452.
@article{osti_22398967,
title = {Crossover between weak anti-localization and weak localization by Co doping and annealing in gapless PbPdO{sub 2} and spin gapless Co-doped PbPdO{sub 2}},
author = {Choo, S. M. and Lee, K. J. and Park, S. M. and Park, G. S. and Jung, M. H., E-mail: mhjung@sogang.ac.kr and Yoon, J. B. and You, C.-Y.},
abstractNote = {The magnetotransport properties of Pb(Pd,Co)O{sub 2} and PbPdO{sub 2} thin films were investigated. In magnetoconductance curves, we observed a crossover between weak anti-localization (WAL) and weak localization (WL) depending on the annealing and Co doping in PbPdO{sub 2} thin films. For the Pb(Pd,Co)O{sub 2} case showing WAL signals, the ex-situ annealing weakens the Pd-O hybridization by stabilizing Co{sup 3+} states and generating Pd{sup 1+} states, instead of Pd{sup 2+}, so that the spin-orbit coupling (SOC) strength is significantly reduced. It causes the dominant magnetotransport mechanism change from WAL to WL. This annealing effect is compared with the PbPdO{sub 2} case, which possesses WL signals. The annealing process stabilizes the oxygen states and enhances the Pd-O hybridization, and consequently the SOC strength is enhanced. Our experimental results are well explained by the Hikami-Larkin-Nagaoka theory in terms of two important physical parameters; SOC strength-related α and inelastic scattering length l{sub ϕ}.},
doi = {10.1063/1.4919452},
journal = {Applied Physics Letters},
issn = {0003-6951},
number = 17,
volume = 106,
place = {United States},
year = {2015},
month = {4}
}