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Electronic Behavior of Superconducting SmFeAsO0.75

By Y. Sun, Y. Ding, B. C. Zheng, Z. X. Shi and Z. A. Ren


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.Comment: 10 pages, 6 figure

Topics: Condensed Matter - Superconductivity
Year: 2011
DOI identifier: 10.1063/1.3573667
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