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:
-
- Department of Advanced Materials Science, University of Tokyo (Japan)
- Department of Materials Science and Technology, Tokyo University of Science (Japan)
- Institute for Multidisciplinary Research for Advanced Materials, Tohoku University (Japan)
- Japan Atomic Energy Agency (Japan)
- Publication Date:
- OSTI Identifier:
- 21544763
- Resource Type:
- Journal Article
- Journal Name:
- Physical Review. B, Condensed Matter and Materials Physics
- Additional Journal Information:
- Journal Volume: 83; Journal Issue: 18; Other Information: DOI: 10.1103/PhysRevB.83.184507; (c) 2011 American Institute of Physics; Journal ID: ISSN 1098-0121
- 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. https://doi.org/10.1103/PHYSREVB.83.184507
Nagatochi, T, Sumiyoshi, A, Kimura, K, Hyodo, H, Soga, K, Sato, Y, Terauchi, M, and Esaka, F. 2011.
"Superconductivity in Li-doped {alpha}-rhombohedral boron". United States. https://doi.org/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},
url = {https://www.osti.gov/biblio/21544763},
journal = {Physical Review. B, Condensed Matter and Materials Physics},
issn = {1098-0121},
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}
}