Aligned crystallite powder ofNdFeAsO0.86F0.14: Magnetic hysteresis and penetration depth

2009/05/28 by Yuri L. Zuev, Eliot D. Specht, E. D. Specht +12 · 4 citations
Chemistry · Materials Science · Physics and Astronomy · #Analytical Chemistry (journal) #Chemistry #Condensed matter physics #Crystallite #Crystallography #Iron-based superconductors research #Lambda #London penetration depth #Magnetic and transport properties of perovskites and related materials #Materials science #Non-blocking I/O #Optics #Penetration depth #Physics #Physics of Superconductivity and Magnetism #cond-mat.supr-con

paper · pdf · doi:10.1103/physrevb.79.224523

published in Physical Review B 79(22) (American Physical Society) · 6 pages, 6 figures

arxiv created 2009/05/28 · openalex publication_date 2009/06/19 · arxiv updated 2015/05/13 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05

Abstract

We report the basal-plane critical current and superfluid density of magnetically aligned NdFeAsO_0.86F_0.14 powder. This sample has individual crystallite grains permanently oriented with their c axis along the external measuring field. Magnetic irreversibilities at high field suggest strong flux pinning of basal-plane critical currents, with monotonic field dependence and no evidence of the ``fishtail'' effect. The small particles provide a sensitive indicator of dc flux penetration and allow analysis of the temperature dependence of ab-plane London penetration depth \ensuremathλ_ab,L, which is quadratic at low T. This feature may not necessarily be due to the nodes in the gap but may be rather a sign of a strong pair breaking. A quantitative determination of the absolute magnitude of \ensuremathλ_ab,L is hindered by the need for accurate knowledge of the particle size distribution.

Citations

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