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Possible two-gap superconductivity in NdFeAsO<sub>0.9</sub>F<sub>0.1</sub>probed by point-contact Andreev-reflection spectroscopy
Systematic studies of the NdFeAsOF superconducting energy gap using point-contact Andreev-reflection (PCAR) spectroscopy are presented. At low temperatures the PCAR conductance spectra show a pair of gap-like peaks at about ± (4–7) mV and in most cases also a pair of humps at around ± 10 mV. Fits to the …