Possible two-gap superconductivity in NdFeAs(O,F) probed by point-contact Andreev-reflection spectroscopy

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dc.creatorSamuely, P.
dc.creatorSzabo, P.
dc.creatorPribulova, Z.
dc.creatorTillman, M. E.
dc.creatorBud'ko, S.
dc.creatorCanfield, P. C.
dc.date2008-06-10
dc.date2008-10-13
dc.date.accessioned2026-07-07T12:26:56Z
dc.date.available2026-07-07T12:26:56Z
dc.descriptionSystematic studies of the NdFeAsOF superconducting energy gap via the point-contact Andreev-reflection (PCAR) spectroscopy are presented. The PCAR conductance spectra show at low temperatures a pair of gap-like peaks at about 4 - 7 mV indicating the superconducting energy gap and in most cases also a pair of humps at around 10 mV. Fits to the s-wave two-gap model of the PCAR conductance allowed to determine two superconducting energy gaps in the system. The energy-gap features however disappear already at T* = 15 to 20 K, much below the particular Tc of the junction under study. At T* a zero-bias conductance (ZBC) peak emerges, which at higher temperatures usually overwhelms the spectrum with intensity significantly higher than the conductance signal at lower temperatures. Possible causes of this unexpected temperature effect are discussed. In some cases the conductance spectra show just a reduced conductance around the zero-bias voltage, the effect persisting well above the bulk transition temperature. This indicates a presence of the pseudogap in the system.
dc.descriptionRevised paper, 6 pages, 5 figures, accepted for Supercond. Sci. & Technol. Special issues: Anisotropic and multiband pairing: from borides to multicomponent superconductivity. Expected online publication: December 2008 (print: January 2009)
dc.identifierhttps://arxiv.org/abs/0806.1672
dc.identifierhttp://arxiv.org/abs/0806.1672
dc.identifierSupercond. Sci. Technol. 22 (2009) 014003
dc.identifierdoi:10.1088/0953-2048/22/1/014003
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/215042
dc.subjectSuperconductivity
dc.titlePossible two-gap superconductivity in NdFeAs(O,F) probed by point-contact Andreev-reflection spectroscopy
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