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We report on 31P-NMR studies of LaFe(As_{1-x}P_x)(O_{1-y}F_{y}) over widecompositions for 0<x<1 and 0<y<0.14, which provide clear evidence thatantiferromagnetic spin fluctuations (AFMSFs) are one of the indispensableelements for enhancing Tc. Systematic 31P-NMR measurements revealed two typesof AFMSFs in the temperature evolution, that is, one is the AFMSFs that developrapidly down to Tc with low-energy characteristics, and the other, withrelatively higher energy than the former, develops gradually upon cooling fromhigh temperature. The low-energy AFMSFs in low y (electron doping) over a widex (pnictogen height suppression) range are associated with the two orbitals ofd_{xz/yz}, whereas the higher-energy ones for a wide y region around low xoriginate from the three orbitals of d_{xy} and d_{xz/yz}. We remark that thenonmonotonic variation of Tc as a function of x and y inLaFe(As_{1-x}P_x)(O_{1-y}F_y) is attributed to these multiple AFMSFsoriginating from degenerated multiple 3d orbitals inherent to Fe-pnictidesuperconductors.

journal of the physical society of japan

Multiple Antiferromagnetic Spin Fluctuations and Novel Evolution of Tc  in Iron-based superconductors LaFe(As1-xPx)(O1-yFy) revealed by 31P-NMR  Studies