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