Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Pressure-induced shift of T$_c$ in K$_x$Sr$_{1-x}$Fe$_2$As$_2$ (x=0.2,
  0.4, 0.7): Analogy to the high-T$_c$ cuprate superconductors   The systematic pressure shifts of T_c were investigated in the whole phase
diagram of the FeAs-based superconducting compound K_xSr_{1-x}Fe_2As_2.
Different regions, arising from corresponding responses of T$_c$ to pressure
(dT_c/dp>0, =0, or <0), can be clearly distinguished. This reveals an
interesting similarity of the FeAs superconductors and the high-T_c cuprates.
This behavior is a manifestation of the layered structure of the FeAs compounds
and the pressure-induced charge transfer between the (Fe_2As_2) and (K/Sr)
layers. The coexistence of superconductivity and spin-density wave behavior
were also observed, and the pressure effects on the latter is explored.

12
The categories of this paper are: nucl-th
26
The categories of this paper are: bayes-an
27
The categories of this paper are: comp-gas
9
The categories of this paper are: nlin
24
The categories of this paper are: dg-ga
8
The categories of this paper are: hep-ex
31
The categories of this paper are: ao-sci
22
The categories of this paper are: chao-dyn
14
The categories of this paper are: math-ph
35
The categories of this paper are: mtrl-th
0
The categories of this paper are: hep-ph
25
The categories of this paper are: patt-sol
19
The categories of this paper are: eess
34
The categories of this paper are: chem-ph
7
The categories of this paper are: hep-th
2
The categories of this paper are: math