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- W2312868104 abstract "Superconducting transition under pressure ($P$) has been investigated for optimum-doped $R$FeAsF$_{rm 1-x}$F$_{rm x}$ ($R$=La, Ce$-$Sm) by dc magnetization measurements. For $R$=La, $T_{rm c}$ is found to be pressure independent up to $P$$sim$3.0 GPa and then shows a monotonic decrease with increasing pressure. The plateau width decreases for the system with smaller lattice constants, and shrinks to almost zero for $R$=Sm. From the $T_{rm c}$($P$) data, we construct the $T_{rm c}$ evolution map on the height of the As atom from the Fe-plane $h_{rm As}$ versus lattice constant $a$ or $c$ plane. It is shown that the characteristic $T_{rm c}$ variations including the $T_{rm c}$$-$$P$ plateau followed by a monotonic decrease and the drastic $T_{rm c}$ decrease by changing $R$-element can be described by a common $T_{rm c}$($h_{rm As}$, $a$ or $c$) surface, suggesting that $T_{rm c}$ is determined by $h_{rm As}$ and lattice constant. It is also suggested that there exists an upper limit of the lattice constant $a_{rm ulm}$ or $c_{rm ulm}$, above which the lattice constant gradient of $T_{rm c}$ changes the sign from positive to negative, as a ridge on the $T_{rm c}$($h_{rm As}$, $a$ or $c$) surface." @default.
- W2312868104 created "2016-06-24" @default.
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- W2312868104 date "2013-03-05" @default.
- W2312868104 modified "2023-09-27" @default.
- W2312868104 title "Superconductivity under pressure for $R$FeAsO$_{rm 1-x}$F$_{rm x}$ ($R$=La, Ce$-$Sm) by dc magnetization measurements" @default.
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