Two Fermi Surface States and Two T_{\text{c}}-Rising Mechanisms Revealed by Transport Properties in RFeP

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We demonstrate the relation between critical temperature T_{\text{c}} and transport properties in RFeP<inf>1-x</inf>As<inf>x</inf>O<inf>0.9</inf>F<inf>0.1</inf>(R = \text{La}, Pr, and Nd). T_{\text{c}} and resistivity power-law exponent n form a universal line on the T_{\text{c}} vs n plane for all the R-systems with x<0.6{\mbox{--}}0.8, indicating that T_{\text{c}} increases with bosonic fluctuation. Transport properties show anomalies suggesting a change of Fermi surfaces around x = 0.6{\mbox{--}}0.8. Above x = 0.6{\mbox{--}}0.8, T_{\text{c}} and n approach the second T_{\text{c}}--n line for the higher T_{\text{c}} systems. A further increase of T_{\text{c}} above x = 0.6{\mbox{--}}0.8 indicates the presence of an additional T_{\text{c}}-rising mechanism in this system.
2013-12-15