Abstract
The effect of alkaline earth substitution on structural parameters was studied in high-quality single crystals of Ba1−xSrxFe2As2 and Sr1−xCaxFe2As2 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 Ba1−xSrxFe2As2 to x = 1 in Sr1−xCaxFe2As2.
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