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

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arxiv 1006.2147 v1 pith:MARBVH2J submitted 2010-06-10 cond-mat.supr-con cond-mat.str-el

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

Shanta R. Saha , Kevin Kirshenbaum , Nicholas P. Butch , Peter Y. Zavalij , Johnpierre Paglione This is my paper
classification cond-mat.supr-con cond-mat.str-el
keywords fe2as2effectalkalinechemicalearthparameterspressureatomic
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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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.

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