Uniform chemical pressure effect in solid solutions Ba(1-x)Sr(x)Fe2As2 and Sr(1-x)Ca(x)Fe2As2

Abstract

The effect of alkaline earth substitution on structural parameters was studied in high-quality single crystals of Ba(1-x)Sr(x)Fe2As2 and Sr(1-x)Ca(x)Fe2As2 grown by the self-flux method. The results of single-crystal and powder x-ray diffraction measurements suggest a continuous monotonic decrease of both a- and c-axis lattice parameters, the c/a tetragonal ratio, and the unit cell volume with decreasing alkaline earth atomic radius as expected by Vegard's law. As a result, the system experiences a continuously increasing chemical pressure effect in traversing the phase diagram from x=0 in Ba(1-x)Sr(x)Fe2As2 to x=1 in Sr(1-x)Ca(x)Fe2As2.

4 pages, 4 figures, and 1 table, submitted to SCES2010 proceedings

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Cited by in corpus (8)

• Structural collapse and superconductivity in rare earth-doped CaFe2As2
• Crystal Growth and Physical Properties of SrCu2As2, SrCu2Sb2 and BaCu2Sb2
• Tuning magnetism in FeAs-based materials via tetrahedral structure
• The change of electronic state and crystal structure by post-annealing in superconducting SrFe2(As0.65P0.35)2
• Strongly three-dimensional electronic structure and Fermi Surfaces of SrFe${}_2$(As${}_{0.65}$P${}_{0.35}$)${}_2$: Comparison with BaFe${}_2$(As${}_{1-x}$P${}_x$)${}_2$
• Temperature-composition Phase Diagrams for Ba1-xSrxFe2As2 and Ba0.5Sr0.5(Fe1-yCoy)2As2
• Data analysis of $ab$ $initio$ effective Hamiltonians in iron-based superconductors $\unicode{x2014}$ Construction of predictors for superconducting critical temperature
• Combined effects of Sr substitution and pressure on the ground states in CaFe${}_2$As${}_2$