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Title: Superconductivity in Li-doped {alpha}-rhombohedral boron

Abstract

Metal transition and superconductivity were observed in Li-doped {alpha}-rhombohedral boron ({alpha}-B{sub 12}). The authors have established a purification method and obtained a large amount of high-purity {alpha}-B{sub 12} powder. Li doping into purified {alpha}-B{sub 12} was attempted by vapor diffusion processing (VDP) in a Mo or Ta tube. Li-doped {alpha}-B{sub 12} contained metallic glittering particles. Meissner effects were observed in such a compound with the nominal composition Li{sub x}B{sub 12} (x = 1.0, 1.4, 1.5, 1.7, or 2.5) (T{sub c} = 3.2-7 K). As for Li{sub 2.5}B{sub 12}, the temperature dependence of its electrical conductivity indicates a metallic character and its electrical resistivity drop is detected near the Meissner temperature. The existence of Li and Fermi edges in Li-doped {alpha}-B{sub 12} crystals was verified by transmission electron microscopy-electron energy loss spectroscopy (TEM-EELS). Lattice expansion, which is a well-known indicator of metal doping into a crystal, was also observed. Thus, Li doping into {alpha}-B{sub 12} was successfully achieved. Our work also suggests that it is possible to dope a larger amount of Li into {alpha}-B{sub 12} and to increase its T{sub c}.

Authors:
; ;  [1]; ;  [2]; ;  [3];  [4]
  1. Department of Advanced Materials Science, University of Tokyo (Japan)
  2. Department of Materials Science and Technology, Tokyo University of Science (Japan)
  3. Institute for Multidisciplinary Research for Advanced Materials, Tohoku University (Japan)
  4. Japan Atomic Energy Agency (Japan)
Publication Date:
OSTI Identifier:
21544763
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physical Review. B, Condensed Matter and Materials Physics; Journal Volume: 83; Journal Issue: 18; Other Information: DOI: 10.1103/PhysRevB.83.184507; (c) 2011 American Institute of Physics
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; BORON; CRYSTALS; DIFFUSION; DOPED MATERIALS; ELECTRIC CONDUCTIVITY; ELECTRONS; ENERGY-LOSS SPECTROSCOPY; EXPANSION; LITHIUM ADDITIONS; METALS; PURIFICATION; SUPERCONDUCTIVITY; TEMPERATURE DEPENDENCE; TRANSMISSION ELECTRON MICROSCOPY; TRIGONAL LATTICES; ALLOYS; CRYSTAL LATTICES; CRYSTAL STRUCTURE; ELECTRICAL PROPERTIES; ELECTRON MICROSCOPY; ELECTRON SPECTROSCOPY; ELEMENTARY PARTICLES; ELEMENTS; FERMIONS; LEPTONS; LITHIUM ALLOYS; MATERIALS; MICROSCOPY; PHYSICAL PROPERTIES; SEMIMETALS; SPECTROSCOPY

Citation Formats

Nagatochi, T., Sumiyoshi, A., Kimura, K., Hyodo, H., Soga, K., Sato, Y., Terauchi, M., and Esaka, F. Superconductivity in Li-doped {alpha}-rhombohedral boron. United States: N. p., 2011. Web. doi:10.1103/PHYSREVB.83.184507.
Nagatochi, T., Sumiyoshi, A., Kimura, K., Hyodo, H., Soga, K., Sato, Y., Terauchi, M., & Esaka, F. Superconductivity in Li-doped {alpha}-rhombohedral boron. United States. doi:10.1103/PHYSREVB.83.184507.
Nagatochi, T., Sumiyoshi, A., Kimura, K., Hyodo, H., Soga, K., Sato, Y., Terauchi, M., and Esaka, F. Sun . "Superconductivity in Li-doped {alpha}-rhombohedral boron". United States. doi:10.1103/PHYSREVB.83.184507.
@article{osti_21544763,
title = {Superconductivity in Li-doped {alpha}-rhombohedral boron},
author = {Nagatochi, T. and Sumiyoshi, A. and Kimura, K. and Hyodo, H. and Soga, K. and Sato, Y. and Terauchi, M. and Esaka, F.},
abstractNote = {Metal transition and superconductivity were observed in Li-doped {alpha}-rhombohedral boron ({alpha}-B{sub 12}). The authors have established a purification method and obtained a large amount of high-purity {alpha}-B{sub 12} powder. Li doping into purified {alpha}-B{sub 12} was attempted by vapor diffusion processing (VDP) in a Mo or Ta tube. Li-doped {alpha}-B{sub 12} contained metallic glittering particles. Meissner effects were observed in such a compound with the nominal composition Li{sub x}B{sub 12} (x = 1.0, 1.4, 1.5, 1.7, or 2.5) (T{sub c} = 3.2-7 K). As for Li{sub 2.5}B{sub 12}, the temperature dependence of its electrical conductivity indicates a metallic character and its electrical resistivity drop is detected near the Meissner temperature. The existence of Li and Fermi edges in Li-doped {alpha}-B{sub 12} crystals was verified by transmission electron microscopy-electron energy loss spectroscopy (TEM-EELS). Lattice expansion, which is a well-known indicator of metal doping into a crystal, was also observed. Thus, Li doping into {alpha}-B{sub 12} was successfully achieved. Our work also suggests that it is possible to dope a larger amount of Li into {alpha}-B{sub 12} and to increase its T{sub c}.},
doi = {10.1103/PHYSREVB.83.184507},
journal = {Physical Review. B, Condensed Matter and Materials Physics},
number = 18,
volume = 83,
place = {United States},
year = {Sun May 01 00:00:00 EDT 2011},
month = {Sun May 01 00:00:00 EDT 2011}
}