Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Uniform chemical pressure effect in solid solutions Ba(1-x)Sr(x)Fe2As2
  and Sr(1-x)Ca(x)Fe2As2   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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The categories of this paper are: hep-ph
8
The categories of this paper are: hep-ex
18
The categories of this paper are: econ
32
The categories of this paper are: atom-ph
3
The categories of this paper are: physics
1
The categories of this paper are: cs
33
The categories of this paper are: plasm-ph
25
The categories of this paper are: patt-sol
16
The categories of this paper are: stat
9
The categories of this paper are: nlin
2
The categories of this paper are: math
11
The categories of this paper are: hep-lat
21
The categories of this paper are: adap-org
13
The categories of this paper are: quant-ph
19
The categories of this paper are: eess
36
The categories of this paper are: cmp-lg