Volume 83, Number 5, September 2008
|Number of page(s)||5|
|Section||Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties|
|Published online||27 August 2008|
Point-contact spectroscopy of iron-based layered superconductor
National Laboratory for Superconductivity, Institute of Physics and Beijing National Laboratory for Condensed Matter Physics, Chinese Academy of Sciences - P.O. Box 603, Beijing 100190, China
Corresponding author: firstname.lastname@example.org
Accepted: 17 July 2008
We present point-contact spectroscopy data for junctions between a normal metal and the newly discovered F-doped superconductor (F-LaOFeAs). A zero-bias conductance peak was observed and its shape and magnitude suggest the presence of Andreev bound states at the surface of F-LaOFeAs, which provides a possible evidence of an unconventional pairing symmetry with a nodal gap function. The maximum gap value ≈ 3.9±0.7 meV was determined from the measured spectra, in good agreement with the recent experiments on specific heat and lower critical field.
PACS: 74.20.Rp – Pairing symmetries (other than s-wave) / 74.50.+r – Tunneling phenomena; point contacts, weak links, Josephson effects / 74.70.Dd – Ternary, quaternary, and multinary compounds (including Chevrel phases, borocarbides, etc.)
© EPLA, 2008
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