期刊
SCIENCE IN CHINA SERIES G-PHYSICS MECHANICS & ASTRONOMY
卷 51, 期 6, 页码 715-718出版社
SCIENCE PRESS
DOI: 10.1007/s11433-008-0074-x
关键词
upper critical field; Fe-based superconductor
Using the solid state reaction method, we have synthesized the polycrystalline F-doped NdO0.88F0.12FeAs and CeO0.88F0.12FeAs with the superconducting transition temperatures at about 48 and 40 K, respectively. To obtain the upper critical field H (c2) of Nd(Ce)O0.88F0.12FeAs samples, we measured the electrical resistivity under magnetic field up to 14 T. Based on the Werthamer-Helfand-Hohenberg (WHH) relation together with the H (c2)(T) curves in a relatively high field, we estimated that these superconductors have a rather high upper critical field of about 115 T for Nd-based and 107 T for Ce-based samples, indicating the similarities between these ReO1-x F (x) FeAs (Re = rare earth element) superconductors and high T (c) cuprate superconductors.
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