Superconductivity under pressure in $R$FeAsO${}_{1-\mathrm{x}}$F${}_{\mathrm{x}}$ ($R$=La, Ce$-$Sm) by dc magnetization measurements

Abstract

Superconducting transition under pressure ($P$) has been investigated for optimum-doped $R$FeAsO${}_{1-\mathrm{x}}$F${}_{\mathrm{x}}$ ($R$=La, Ce$-$Sm) by dc magnetization measurements. For $R$=La, $T_{\mathrm{c}}$ is found to be pressure independent up to $P$$\sim$3.0 GPa and then shows a monotonic decrease with increasing pressure. The plateau width decreases for the system with smaller lattice constants, and shrinks to almost zero for $R$=Sm. From the $T_{\mathrm{c}}$($P$) data, we construct the $T_{\mathrm{c}}$ evolution map on the height of the As atom from the Fe-plane $h_{\mathrm{As}}$ versus lattice constant $a$ or $c$ plane. It is shown that the characteristic $T_{\mathrm{c}}$ variations under pressure for all compounds and the rapid decrease in $T_{\mathrm{c}}$ induced by changing $R$-element from Sm to La can be described by a common $T_{\mathrm{c}}$($h_{\mathrm{As}}$, $a$ or $c$) surface, suggesting that $T_{\mathrm{c}}$ is determined by $h_{\mathrm{As}}$ and lattice constant. It is also suggested that there exists an upper limit of the lattice constant $a_{\mathrm{ulm}}$ (or $c_{\mathrm{ulm}}$), above which $d{T}_{\mathrm{c}}$$da$ (or $d{T}_{\mathrm{c}}$$dc$) changes the sign from positive to negative.

7 pages, 6 figures

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