Anisotropic Phase Diagram and Superconducting Fluctuations in SmFeAsO0.85F0.15

Details Anisotropic Phase Diagram and Superconducting Fluctuations in SmFeAsO0.85F0.15 Anisotropic Phase Diagram and Superconducting Fluctuations in SmFeAsO0.85F0.15

2011-01-31

arxiv.org/abs/1101.6027v1

Phys. Rev. B 83, 100513(R) (2011)

Physics

Condensed Matter

Superconductivity

13 pages, 4 Figures, Subm. Phys. Rev. B

Scientific paper

10.1103/PhysRevB.83.100513

We report on the specific heat determination of the anisotropic phase diagram of single crystals of optimally doped SmFeAsO1-xFx. In zero-field, the optimally doped compound displays a clear cusp-like anomaly in C/T with {\Delta}C/Tc = 24 mJ/molK2 at Tc = 49.5 K. In magnetic fields applied along the c-axis, we find pronounced superconducting fluctuations induced 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/Tc yields a Sommerfeld coefficient {\gamma} ~ 8 mJ/molK2 indicating that SmFeAsO1-xFx is characterized by a modest density of states and strong coupling.

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