Two Fermi surface states and two $T_{\mathrm{c}}$-rising mechanisms revealed by transport properties in $R$FeP${}_{1-x}$As${}_x$O${}_{0.9}$F${}_{0.1}$ ($R$=La, Pr and Nd)

Abstract

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

12 pages, 5 figures. Accepted for the publication in JPSJ

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• Evolution of the Phase Diagram of LaFeP${}_{1-x}$As${}_x$O${}_{1-y}$F${}_y$ ($y$ = 0 -- 0.1)
• Enhancement of Superconducting Transition Temperature Due to Antiferromagnetic Spin Fluctuations in Iron-pnictides LaFe(As_{1-x}P_x)(O_{1-y}F_y) : 31P-NMR Studies
• Origin of the non-monotonic variance of Tc in the 1111 iron based superconductors with isovalent doping
• Three superconducting phases with different categories of pairing in hole- and electron-doped LaFeAs${}_{1-x}$P${}_x$O
• Importance of dxy orbital and electron correlation in iron-based superconductors revealed by phase diagram for 1111-system
• Multiple-pseudogap phases in hydrogen-doped LaFeAsO system
• Theoretical study on the correlation between the spin fluctuation and $T_c$ in the isovalent-doped 1111 iron-based superconductors
• Enhanced superconductivity and moderate spin fluctuations suppressed at low energies in heavily electron-doped La1111-based superconductor
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• Neutron powder diffraction study on the non-superconducting phases of ThFeAsN${}_{1-x}$O${}_x$ ($x=0.15,0.6$) iron pnictide
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