Direct observation of the influence of the As-Fe-As angle on the Tc of superconducting SmFeAsO${}_{1-x}$F${}_x$

Abstract

The electrical resistivity, crystalline structure and electronic properties calculated from the experimentally measured atomic positions of the compound SmFeAsO${}_{0.81}$F${}_{0.19}$ have been studied up to pressures ~20GPa. The correlation between the pressure dependence of the superconducting transition temperature (Tc) and crystallographic parameters on the same sample shows clearly that a regular FeAs${}_4$ tetrahedron maximizes Tc, through optimization of carrier transfer to the FeAs planes as indicated by the evolution of the electronic band structures.

arXiv comment15pages, 4 figures

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Cited by in corpus (9)

• The Unexpected Properties of Alkali Metal Iron Selenide Superconductors
• Comprehensive Eliashberg analysis of microwave conductivity and penetration depth of K-, Co-, and P-substituted BaFe2As2
• Iron-based superconductivity extended to the novel silicide LaFeSiH
• Mutual independence of critical temperature and superfluid density under pressure in optimally electron-doped superconducting LaFeAsO${}_{1-x}$F${}_x$
• Superconductivity under pressure in $R$FeAsO${}_{1-\mathrm{x}}$F${}_{\mathrm{x}}$ ($R$=La, Ce$-$Sm) by dc magnetization measurements
• Pressure dependence of the low- temperature crystal structure and phase transition behaviour of CaFeAsF and SrFeAsF: A synchrotron x-ray diffraction study
• Compressibility and pressure-induced disorder in superconducting phase-separated Cs0.72Fe1.57Se2
• Non-linear lattice response of SmFeAsO_{1-x}F_{x} superconductor to hydrostatic pressure
• Correlation between non-centrosymmetry and superconductivity in quasi-one-dimensional compounds A2Cr3As3 (A=K, Rb)