Physics – Condensed Matter – Superconductivity
Scientific paper
2008-08-25
submiited on 24 Aug. 2008
Physics
Condensed Matter
Superconductivity
8 pages, 3 figures
Scientific paper
10.1088/0953-8984/21/20/205701
We measured the initial M-H curves for a sample of the newly discovered superconductor NdFeAsO0.82Fe0.18, which had a critical temperature, Tc, of 51 K, and was fabricated at the high pressure of 6 GPa. The lower critical field, Hc1, was extracted from the deviation point of the Meissner linearity in the M-H curves, which show linear temperature dependence in the low temperature region down to 5 K. The Hc1(T) indicates no s-wave superconductivity, but rather an unconventional superconductivity with a nodal gap structure. Furthermore, the linearity of Hc1 at low temperature does not hold at high temperature, but shows other characteristics, indicating that this superconductor might have multi-gap features. Based on the low temperature nodal gap structure, we estimate that the maximum gap magnitude delta 0 = (1.6+- 0.2) kBTc.
Dou Shi Xue
Lee Sung-Ik
Li Zheng-Cai
Ren Z.-A.
Wang Xue-Lei
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