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Anisotropic phase diagram and superconducting fluctuations of single-crystalline SmFeAsO(0.85)F(0.15)
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2011 (English)In: Physical Review B. Condensed Matter and Materials Physics, ISSN 1098-0121, E-ISSN 1550-235X, Vol. 83, no 10, 100513- p.Article in journal (Refereed) Published
Abstract [en]

We report on the specific-heat determination of the anisotropic phase diagram of single crystals of optimally doped SmFeAsO(1-x)F(x). In zero field, we find a clear cusplike anomaly in C/T with Delta C/T(c) = 24 mJ/mol K(2) at T(c) = 49.5 K. In magnetic fields along the c axis, pronounced superconducting fluctuations induce broadening and suppression of the specific-heat anomaly which can be described using three-dimensional lowest-Landau-level scaling with an upper critical field slope of -3.5 T/K and an anisotropy of Gamma = 8. The small value of Delta C/T(c) yields a Sommerfeld coefficient gamma similar to 8 mJ/mol K(2), indicating that SmFeAsO(1-x)F(x) is characterized by a modest density of states and strong coupling.

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2011. Vol. 83, no 10, 100513- p.
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Physical Sciences
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URN: urn:nbn:se:su:diva-69102DOI: 10.1103/PhysRevB.83.100513ISI: 000288782300001OAI: oai:DiVA.org:su-69102DiVA: diva2:474930
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authorCount :8Available from: 2012-01-10 Created: 2012-01-10 Last updated: 2017-12-08Bibliographically approved

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