Change of Fermi surface states related with two different T_{\rm c}-raising mechanisms in iron pnictide superconductor

Evolution of Fermi surface (FS) states of NdFeAs_{1-x}P_xO_{0.9}F_{0.1} single crystals with As/P substitution has been investigated. The critical temperature T_{\rm c} and the power law exponent (n) of temperature-dependent resistivity (\rho(T) = \rho_0 + AT^n) show a clear correlation above x=0.2, suggesting that T_{\rm c} is enhanced with increasing bosonic... Show more