Direct observation of the influence of the As-Fe-As angle on the Tc of superconducting SmFeAsO1−xFx

G. Garbarino; R. Weht; A. Sow; A. Sulpice; P. Toulemonde; M. Álvarez-Murga; P. Strobel; P. Bouvier; M. Mezouar; M. Núñez-Regueiro

doi:10.1103/PhysRevB.84.024510

Direct observation of the influence of the As-Fe-As angle on the Tc of superconducting SmFeAsO1−xFx

G. Garbarino, R. Weht, A. Sow, A. Sulpice, P. Toulemonde, M. Álvarez-Murga, P. Strobel, P. Bouvier, M. Mezouar, M. Núñez-Regueiro

DOI 10.1103/PhysRevB.84.024510 · Physical Review B

T1

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Abstract

The electrical resistivity, crystalline structure, and electronic properties calculated from the experimentally measured atomic positions of the compound SmFeAsO0.81F0.19 have been studied up to pressures ∼20 GPa. The correlation between the pressure dependence of the superconducting transition temperature (Tc) and crystallographic parameters on the same sample shows clearly that a regular FeAs4 tetrahedron maximizes Tc through optimization of carrier transfer to the FeAs planes as indicated by the evolution of the electronic band structures.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
SmFeAsO0.81F0.19 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	54	Pressure unresolved	onset
SmFeAsO0.81F0.19 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	54	Pressure unresolved	onset
SmFeAsO0.81F0.19 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	55.2	0.6 GPa	onset