Upper critical field and fluctuation conductivity in the critical regime of doped SmFeAsO

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dc.creatorPallecchi, I.
dc.creatorFanciulli, C.
dc.creatorTropeano, M.
dc.creatorPalenzona, A.
dc.creatorFerretti, M.
dc.creatorMalagoli, A.
dc.creatorMartinelli, A.
dc.creatorSheikin, I.
dc.creatorPutti, M.
dc.creatorFerdeghini, C.
dc.date2009-02-06
dc.date.accessioned2026-07-07T12:54:42Z
dc.date.available2026-07-07T12:54:42Z
dc.descriptionWe measure magnetotransport of F doped SmFeAsO samples up to 28T and we extract the upper critical fields, using different criteria. In order to circumvent the problem of criterion-dependence Hc2 values, we suggest a thermodynamic estimation of the upper critical field slope dHc2/dT based on the analysis of conductivity fluctuations in the critical regime. A high field slope as large as -12T/K is thus extracted for the optimally doped sample. We find evidence of a two-dimensional lowest Landau level (LLL) scaling for applied fields larger than mu_0H_LLL=8T. Finally, we estimate the coherence length values and we observe that they progressively increase with decreasing Tc. In all cases, the coherence length values along the c axis are smaller than the interplanar distance, confirming the two-dimensional nature of superconductivity in this compound.
dc.description14 pages, 4 figures, 3 tables Submitted to Phys.Rev.B
dc.identifierhttps://arxiv.org/abs/0902.1066
dc.identifierhttp://arxiv.org/abs/0902.1066
dc.identifierPhys. Rev. B 79, 104515 (2009)
dc.identifierdoi:10.1103/PhysRevB.79.104515
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/224027
dc.subjectSuperconductivity
dc.subjectMaterials Science
dc.titleUpper critical field and fluctuation conductivity in the critical regime of doped SmFeAsO
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