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Superconductivity under pressure in RFeAsO1-xFx (R = La, Ce-Sm) by dc magnetization measurements.

Authors :
Miyoshi, Kiyotaka
Kojima, Eiko
Ogawa, Saki
Shimojo, Yuta
Takeuchi, Jun
Source :
Physical Review B: Condensed Matter & Materials Physics. Jun2013, Vol. 87 Issue 23, p235111-1-235111-6. 6p.
Publication Year :
2013

Abstract

Superconducting transition under pressure (P) has been investigated for optimum-doped RFeAsO1-xFx (R=La, Ce-Sm) by dc magnetization measurements. For R=La, Tc is found to be pressure independent up to P~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 Tc(P) data, we construct the Tc evolution map on the height of the As atom from the Fe-plane hAs versus lattice-constant a or c plane. It is shown that the characteristic Tc variations under pressure for all compounds and the rapid decrease in Tc induced by changing the R element from Sm to La can be described by a common Tc (hAs, a or c) surface, suggesting that Tc is determined by hAs and lattice constant. It is also suggested that there exists an upper limit of the lattice constant aulm (or culm), above which dTc/da (or dTc/dc) changes the sign from positive to negative. [ABSTRACT FROM AUTHOR]

Details

Language :
English
ISSN :
10980121
Volume :
87
Issue :
23
Database :
Academic Search Index
Journal :
Physical Review B: Condensed Matter & Materials Physics
Publication Type :
Academic Journal
Accession number :
89630465
Full Text :
https://doi.org/10.1103/PhysRevB.87.235111