Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Superconductivity with Tc=7 K under pressure for Cu-, and Au-doped
  BaFe2As2   It is noteworthy that chemical substitution of BaFe2As2 (122) with the noble
elements Cu and Au gives superconductivity with a maximum Tc=3 K, while Ag
substitution (Ag-122) stays antiferromagnetic. For Ba(Fe1-xTMx)2As2, TM= Cu,
Au, or Ag, and by doping an amount of x=0.04, a-lattice parameter slightly
increases (0.4%) for all TM dopants, while c-lattice decreases (-0.2%) for
TM=Cu, barely moves (0.05%) for Au, and increases (0.2%) for Ag. Despite the
naive expectation that the noble elements of group 11 should affect the quantum
properties of 122 similarly, they produce significant differences extending to
the character of the ground state. For the Ag-122 crystal, evidence of only a
filamentary superconductivity is noted with pressure. However, for Au and Cu
doping (x=0.03) we find a substantial improvement in the superconductivity,
with Tc increasing to 7 K and 7.5 K, respectively, under 20 kbar of pressure.
As with the ambient pressure results, the identity of the dopant therefore has
a substantial impact on the ground state properties. Density functional theory
calculations corroborate these results and find evidence of strong electronic
scattering for Au and Ag dopants, while Cu is comparatively less disruptive to
the 122 electronic structure.

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The categories of this paper are: dg-ga
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The categories of this paper are: math-ph
35
The categories of this paper are: mtrl-th
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The categories of this paper are: nlin
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The categories of this paper are: q-bio
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The categories of this paper are: eess
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The categories of this paper are: gr-qc
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The categories of this paper are: alg-geom
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The categories of this paper are: supr-con
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The categories of this paper are: hep-th
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The categories of this paper are: cmp-lg
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The categories of this paper are: q-fin
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The categories of this paper are: ao-sci
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The categories of this paper are: adap-org
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The categories of this paper are: nucl-ex
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The categories of this paper are: atom-ph