Scanning tunneling spectroscopy of SmFeAsO0.85: Possible evidence for d-wave order parameter symmetry

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dc.creatorMillo, Oded
dc.creatorAsulin, Itay
dc.creatorYuli, Ofer
dc.creatorFelner, Israel
dc.creatorRen, Zhi-An
dc.creatorShen, Xiao-Li
dc.creatorChe, Guang-Can
dc.creatorZhao, Zhong-Xian
dc.date2008-07-02
dc.date.accessioned2026-07-07T10:04:32Z
dc.date.available2026-07-07T10:04:32Z
dc.descriptionWe report a scanning tunneling spectroscopy investigation of polycrystalline SmFeAsO0.85 having a superconducting transition at 52 K. On large regions of the sample surface the tunneling spectra exhibited V-shaped gap structures with no coherence peaks, indicating degraded surface properties. In some regions, however, the coherence peaks were clearly observed, and the V-shaped gaps could be fit to the theory of tunneling into a d-wave superconductor, yielding gap values between 8 to 8.5 meV, corresponding to the ratio 2D/KTc ~ 3.55 - 3.8, which is slightly above the BCS weak-coupling prediction. In other regions the spectra exhibited zero-bias conductance peaks, consistent with a d-wave order parameter symmetry.
dc.identifierhttps://arxiv.org/abs/0807.0359
dc.identifierhttp://arxiv.org/abs/0807.0359
dc.identifierPhys. Rev. B 78, 092505 (2008)
dc.identifierdoi:10.1103/PhysRevB.78.092505
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/169710
dc.subjectSuperconductivity
dc.titleScanning tunneling spectroscopy of SmFeAsO0.85: Possible evidence for d-wave order parameter symmetry
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