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We have investigated the electronic, magnetic, and optical properties of two Fe-based superconductors and related parent compounds via three powerful techniques: scanning tunneling microscopy/spectroscopy (STM/S), high-temperature vibrating sample magnetometry, and optical transmission spectroscopy (OTS). Below the superconducting transition temperature T c ∼ 48 K, the STM/S of polycrystalline NdFeAsO 0.86 F 0.14 reveals a single-gap feature. The quantitative fitting of STS data results indoi:10.1088/0953-2048/23/5/054005 fatcat:c5lvpzlsybabnbl3f24kjnv4ke