Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Crystal Growth and Physical Properties of SrCu2As2, SrCu2Sb2 and
  BaCu2Sb2   We report the growth of single crystals of SrCu2As2, SrCu2Sb2,
SrCu2(As{0.84}Sb{0.16})2 and BaCu2Sb2 using the self-flux technique and their
structural, magnetic, thermal and transport properties that were investigated
by powder x-ray diffraction (XRD), magnetic susceptibility chi, specific heat
Cp and electrical resistivity rho measurements versus temperature T from 1.8 to
350 K. Rietveld refinements of XRD patterns for crushed crystals confirm that
SrCu2As2 crystallizes in the ThCr2Si2-type structure and SrCu2Sb2 crystallizes
in the CaBe2Ge2-type structure. However, BaCu2Sb2 is found to have a large unit
cell consisting of three blocks. Here a ThCr2Si2-type block is sandwiched
between two CaBe2Ge2-type blocks along the c-axis, as reported, but likely with
a monoclinic distortion. The chi data of all these compounds are diamagnetic
and reveal nearly T-independent anisotropic behavior. The finite values of the
Sommerfeld linear specific heat coefficients gamma and the T dependences of rho
reveal metallic character of all four compounds. The electronic and magnetic
properties indicate that these compounds are sp metals with Cu in the 3d^{10}
electronic configuration corresponding to the oxidation state Cu^{+1}, as
previously predicted theoretically for (Sr,Ba)Cu2As2 by D. J. Singh. We find
that SrCu2As2 has a collapsed-tetragonal structure. The electronic character of
the Cu and the strength of the As-As interlayer bonding are both expected to
drastically change between weakly Cu-substituted BaFe2As and pure BaCu2As2.

21
The categories of this paper are: adap-org
37
The categories of this paper are: supr-con
16
The categories of this paper are: stat
22
The categories of this paper are: chao-dyn
10
The categories of this paper are: q-bio
11
The categories of this paper are: hep-lat
34
The categories of this paper are: chem-ph
20
The categories of this paper are: acc-phys
30
The categories of this paper are: q-alg
24
The categories of this paper are: dg-ga
14
The categories of this paper are: math-ph
36
The categories of this paper are: cmp-lg
26
The categories of this paper are: bayes-an
1
The categories of this paper are: cs
19
The categories of this paper are: eess
13
The categories of this paper are: quant-ph