Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Synthesis and properties of La-doped CaFe2As2 single crystals with Tc =
  42.7 K   Large single crystals of La-doped CaFe2As2 were successfully synthesized by
the FeAs self-flux method. The x-ray diffraction patterns suggest high
crystalline quality and c-axis orientation. By substitution of trivalent La3+
ions for divalent Ca2+, the resistivity anomaly in the parent compound CaFe2As2
is completely suppressed and a superconducting transition reaches the value of
42.7 K, which is higher than that of about 30 K reported in Saha S. R. et al.,
arXiv:1105.4798v1. The upper critical field has been determined with the
magnetic field along ab-plane and c-axis, yielding an anisotropy of about 3.3.

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The categories of this paper are: atom-ph
9
The categories of this paper are: nlin
17
The categories of this paper are: q-fin
31
The categories of this paper are: ao-sci
36
The categories of this paper are: cmp-lg
25
The categories of this paper are: patt-sol
0
The categories of this paper are: hep-ph
26
The categories of this paper are: bayes-an
22
The categories of this paper are: chao-dyn
8
The categories of this paper are: hep-ex
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The categories of this paper are: funct-an
28
The categories of this paper are: alg-geom
35
The categories of this paper are: mtrl-th
18
The categories of this paper are: econ
24
The categories of this paper are: dg-ga
7
The categories of this paper are: hep-th