Electronic Behavior of Superconducting SmFeAsO0.75

Abstract

High-quality polycrystalline SmFeAsO0.75 was synthesized with a superconducting transition width less than 1 K, and the electronic behavior was systematically studied by transport and specific heat measurements. An obvious superconducting jump was witnessed, together with a very small normalized superconducting jump, which is much smaller than expected by the BCS theory. A strong temperature dependent Hall coefficient was found and attributed to the partial gapping of the Fermi surface up to the temperature of 160 K which was predicted and supported by the emergence of the pseudogap. The charge-carrier density as well as the effective mass were also obtained and discussed in detail.

10 pages, 6 figures

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• Specific-heat study of superconducting and normal states in FeSe1-xTex (0.6<=x<=1) single crystals: Strong-coupling superconductivity, strong electron-correlation, and inhomogeneity
• Coexistence of two superconducting phases in Ca1-xLaxFe2As2
• Density effect on critical current density and flux pinning properties of polycrystalline SmFeAsO1-xFx superconductor
• Anomalous Tail Effect on Resistivity Transition and Weak-link Behavior of Iron Based Superconductor
• Upper Critical Fields and Anisotropy of Ca1-xLaxFe2As2 Single Crystals
• Complete electronic phase diagram and enhanced superconductivity in fluorine-doped PrFeAsO1-xFx
• Effects of the sintering atmosphere on the superconductivity of SmFeAsO1-xFx compounds