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Title: Improving superconductivity in BaFe2As2-based crystals by cobalt clustering and electronic uniformity

Abstract

Quantum materials such as antiferromagnets or superconductors are complex in that chemical, electronic, and spin phenomena at atomic scales can manifest in their collective properties. Although there are some clues for designing such materials, they remain mainly unpredictable. In this work, we find that enhancement of transition temperatures in BaFe2As2-based crystals are caused by removing local-lattice strain and electronic-structure disorder by thermal annealing. While annealing improves Neel-ordering temperature in BaFe2As2 crystal (TN=132K to 136K) by improving in-plane electronic defects and reducing overall a-lattice parameter, it increases superconducting-ordering temperature in optimally cobalt-doped BaFe2As2 crystal (Tc=23 to 25K) by precipitating-out the cobalt dopants and giving larger overall a-lattice parameter. And while annealing improves local chemical and electronic uniformity resulting in higher TN in the parent, it also promotes nanoscale phase separation in the superconductor resulting in lower disparity and strong superconducting band gaps in the dominant crystal regions, which lead to both higher overall Tc and critical-current-density, Jc

Authors:
 [1];  [1];  [2];  [3];  [4];  [5]; ORCiD logo [6];  [7]; ORCiD logo [8];  [8]; ORCiD logo [2]; ORCiD logo [2];  [1]; ORCiD logo [1]
  1. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Materials Science and Technology Division
  2. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Center for Nanophase Materials Science
  3. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Materials Science and Technology Division; Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Center for Nanophase Materials Science
  4. Univ. of North Georgia, Dahlonega, GA (United States). Dept. of Physics
  5. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Center for Nanophase Materials Science; Xiamen Univ. (China). Fujian Provincial Key Lab. of Semiconductors and Applications, Collaborative Innovation Center for Optoelectronic Semiconductors adn Efficient Devices and Dept. of Physics
  6. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Chemical and Engineering Materials Division
  7. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Quantum Condensed Matter Division
  8. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Center for Nanophase Materials Science; Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Inst. for Functional Imaging of Materials
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Center for Nanophase Materials Sciences (CNMS); Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). High Flux Isotope Reactor (HFIR)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
OSTI Identifier:
1360062
Grant/Contract Number:  
AC05-00OR22725
Resource Type:
Accepted Manuscript
Journal Name:
Scientific Reports
Additional Journal Information:
Journal Volume: 7; Journal Issue: 1; Journal ID: ISSN 2045-2322
Publisher:
Nature Publishing Group
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; superconducting properties and materials

Citation Formats

Li, L., Zheng, Q., Zou, Q., Rajput, S., Ijaduola, A. O., Wu, Z., Wang, X. P., Cao, H. B., Somnath, S., Jesse, S., Chi, M., Gai, Z., Parker, D., and Sefat, A. S.. Improving superconductivity in BaFe2As2-based crystals by cobalt clustering and electronic uniformity. United States: N. p., 2017. Web. https://doi.org/10.1038/s41598-017-00984-1.
Li, L., Zheng, Q., Zou, Q., Rajput, S., Ijaduola, A. O., Wu, Z., Wang, X. P., Cao, H. B., Somnath, S., Jesse, S., Chi, M., Gai, Z., Parker, D., & Sefat, A. S.. Improving superconductivity in BaFe2As2-based crystals by cobalt clustering and electronic uniformity. United States. https://doi.org/10.1038/s41598-017-00984-1
Li, L., Zheng, Q., Zou, Q., Rajput, S., Ijaduola, A. O., Wu, Z., Wang, X. P., Cao, H. B., Somnath, S., Jesse, S., Chi, M., Gai, Z., Parker, D., and Sefat, A. S.. Wed . "Improving superconductivity in BaFe2As2-based crystals by cobalt clustering and electronic uniformity". United States. https://doi.org/10.1038/s41598-017-00984-1. https://www.osti.gov/servlets/purl/1360062.
@article{osti_1360062,
title = {Improving superconductivity in BaFe2As2-based crystals by cobalt clustering and electronic uniformity},
author = {Li, L. and Zheng, Q. and Zou, Q. and Rajput, S. and Ijaduola, A. O. and Wu, Z. and Wang, X. P. and Cao, H. B. and Somnath, S. and Jesse, S. and Chi, M. and Gai, Z. and Parker, D. and Sefat, A. S.},
abstractNote = {Quantum materials such as antiferromagnets or superconductors are complex in that chemical, electronic, and spin phenomena at atomic scales can manifest in their collective properties. Although there are some clues for designing such materials, they remain mainly unpredictable. In this work, we find that enhancement of transition temperatures in BaFe2As2-based crystals are caused by removing local-lattice strain and electronic-structure disorder by thermal annealing. While annealing improves Neel-ordering temperature in BaFe2As2 crystal (TN=132K to 136K) by improving in-plane electronic defects and reducing overall a-lattice parameter, it increases superconducting-ordering temperature in optimally cobalt-doped BaFe2As2 crystal (Tc=23 to 25K) by precipitating-out the cobalt dopants and giving larger overall a-lattice parameter. And while annealing improves local chemical and electronic uniformity resulting in higher TN in the parent, it also promotes nanoscale phase separation in the superconductor resulting in lower disparity and strong superconducting band gaps in the dominant crystal regions, which lead to both higher overall Tc and critical-current-density, Jc},
doi = {10.1038/s41598-017-00984-1},
journal = {Scientific Reports},
number = 1,
volume = 7,
place = {United States},
year = {2017},
month = {4}
}

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