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Specific heats and transport quantities of the LaFe1-yNiyAsO0.89F0.11 systemhave been measured, and the results are discussed together with those reportedpreviously by our group mainly for LaFe1-yCoyAsO0.89F0.11 andLaFeAsO0.89-xF0.11+x systems. The y dependence of the electronic specific heatcoefficient gamma can basically be understood by using the rigid-band picture,where Ni ions provide 2 electrons to the host conduction bands and behave asnonmagnetic impurities. The superconducting transition temperature Tc ofLaFe1-yNiyAsO0.89F0.11 becomes zero, as the carrier density p (=2y+0.11) dopedto LaFeAsO reaches its critical value p_c_ ~0.2. This p_c_ value of ~0.2 iscommonly observed for LaFe1-yCoyAsO0.89F0.11 and LaFeAsO0.89-xF0.11+x systems,in which the relations p = x+0.11 and p = y+0.11 hold, respectively. As wepointed out previously, the critical value corresponds to the disappearance ofthe hole-Fermi surface. These results indicate that the carrier number solelydetermines the Tc value. We have not observed appreciable effects of pairbreaking, which originates from the nonmagnetic impurity scattering ofconduction electrons and strongly suppresses T_c_ values of systems withsign-reversing of the order parameter over the Fermi surface(s). On the basisof the results, the so-called s_+-_ symmetry of the order parameter with thesign-reversing is excluded.

Study of Ni-doping Effect of Specific Heat and Transport Properties for LaFe1-yNiyAsO0.89F0.11