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Upper critical field and fluctuation conductivity in the critical regime of doped SmFeAsO (Articolo in rivista)

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Upper critical field and fluctuation conductivity in the critical regime of doped SmFeAsO (Articolo in rivista) (literal)

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Alternative label

Pallecchi I.; Fanciulli C.; Tropeano M.; Palenzona A.; Ferretti M.; Malagoli A.; Martinelli A.; Sheikin I.; Putti M.; Ferdeghini C. (2009)
Upper critical field and fluctuation conductivity in the critical regime of doped SmFeAsO
in Physical review. B, Condensed matter and materials physics; APS, American physical society, College Park, MD (Stati Uniti d'America)
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Pallecchi I.; Fanciulli C.; Tropeano M.; Palenzona A.; Ferretti M.; Malagoli A.; Martinelli A.; Sheikin I.; Putti M.; Ferdeghini C. (literal)

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In: Physical Review B, vol. 79 article n. 104515. The American Physical Society, 2009. (literal)

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CNR-INFM-LAMIA and Università di Genova, Genova, Italy, DCCI, CNR-IMEM, Genova and Università di Genova, Genova, Italy, GHMFL, MPI-FKF/CNRS, Grenoble, France, CNR-INFM-LAMIA, Università di Genova, Italy and ASC, NHMFL, FSU, Tallahassee, FL, USA (literal)

Titolo

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

Abstract

We measure magnetotransport of F-doped SmFeAsO samples up to 28 T and we extract the upper critical fields, using different criteria. In order to circumvent the problem of criterion-dependent H-c2 values, we suggest a thermodynamic estimation of the upper critical field slope dH(c2)/dT based on the analysis of conductivity fluctuations in the critical regime. A high field slope as large as -12 T/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 H-0(LLL)similar to 8 T. Finally, we estimate the coherence length values and we observe that they progressively increase with decreasing T-c. 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. (literal)

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