Abstract
Magnetization, resistivity and 11B, 59Co NMR measurements have been performed on the Pauli paramagnet , and the superconductors ( K) and ( K). The site selective NMR experiment reveals the multiband nature of the Fermi surface in these systems. The temperature independent Knight shift and 1/T1T clearly indicate the absence of correlated low energy magnetic spin-fluctuations in the normal state, which is in contrast to other Fe-based pnictides. The density of states (DOS) of Co 3d electrons has been enhanced in superconducting and with respect to the non superconducting reference compound . The occurrence of superconductivity is related to the DOS enhancement.
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