caa a22 4500 445383135 CHVBK 20180317143023.0 cr unu---uuuuu 170323e20110701xx s 000 0 eng 10.1007/s10948-010-0869-7 doi (NATIONALLICENCE)springer-10.1007/s10948-010-0869-7 Observation of Multiple Gap Structures Using NdFeAsO1− x F x -GaAs Tunneling Junction [Elektronische Daten] [Masashi Tanaka, Daisuke Shimada] We have carried out point contact tunneling measurements by contacting degenerated GaAs semiconductor to polycrystalline samples of NdFeAsO1−x F x with T c=44−51±1.2. The obtained conductance curves have plural structures included in energy region of the superconducting gap. These structures are seen at almost the same bias positions on every measurement. And as temperature increases, the structures are smeared out. Thus, the structures are attributed to multiple gap structures. The gap values are Δ S=6.3±0.3meV, Δ L=12.5±0.5meV and 2Δ S/k B T c=3.1±0.3, 2Δ L/k B T c=6.2±0.7. Separately from these multiple gap structures, some fine structures are seen in outer energy region of the gap structures. We have calculated d2 I/dV 2 and T c from using conventional s-wave Eliashberg equations by appropriately assuming α 2 F(ω). The phonon positions of the calculated d2 I/dV 2 curve are in quite good agreement with that of experimental result. Moreover, the calculated T c reproduces the experimental one. Springer Science+Business Media, LLC, 2010 Point contact nationallicence Tunneling nationallicence NdFeAsO1− x F x nationallicence Fe-based superconductor-GaAs junction nationallicence Electron-phonon interaction nationallicence Tanaka Masashi Department of Physics, Shizuoka University, 836 Ohya, Suruga-ku, 422-8529, Shizuoka, Japan aut Shimada Daisuke Department of Physics, Shizuoka University, 836 Ohya, Suruga-ku, 422-8529, Shizuoka, Japan aut Journal of Superconductivity and Novel Magnetism Springer US; http://www.springer-ny.com 24/5(2011-07-01), 1491-1495 1557-1939 24:5<1491 2011 24 10948 https://doi.org/10.1007/s10948-010-0869-7 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s10948-010-0869-7 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Tanaka Masashi Department of Physics, Shizuoka University, 836 Ohya, Suruga-ku, 422-8529, Shizuoka, Japan aut NATIONALLICENCE 700 1- Shimada Daisuke Department of Physics, Shizuoka University, 836 Ohya, Suruga-ku, 422-8529, Shizuoka, Japan aut NATIONALLICENCE 773 0- Journal of Superconductivity and Novel Magnetism Springer US; http://www.springer-ny.com 24/5(2011-07-01), 1491-1495 1557-1939 24:5<1491 2011 24 10948 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer