Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Electron doped Ca10(Pt3As8)(Fe2As2)5 and Ca10(Pt4As8)(Fe2As2)5 - High Tc
  superconductors with skutterudite intermediary layers   It has been argued that the very high transition temperatures of the highest
Tc cuprate superconductors are facilitated by enhanced CuO2 plane coupling
through the (Bi,Tl,Hg)-O intermediary layers. Whether enhanced coupling through
intermediary layers can also influence Tc in the iron arsenide superconductors
has never been tested due the lack of appropriate systems for study. Here we
report the crystal structures and properties of two iron arsenide
superconductors, Ca10(Pt3As8)(Fe2As2)5 (the 10-3-8 phase) and
Ca10(Pt4As8)(Fe2As2)5 (the 10-4-8 phase). Based on -Ca-(PtnAs8)-Ca-Fe2As2-
layer stacking, the most important difference in the structures lies in the
structural and electronic characters of the intermediary platinum arsenide
layers. Electron doping through partial substitution of Pt for Fe in the Fe2As2
layers leads to Tc of 11 K in the 10-3-8 phase and 25 K in the 10-4-8 phase.
Using the chemical concepts of Zintl ion electron counting and the stability of
Pt in the 5d8 configuration we argue that the dramatic difference in Tc arises
because the intermediary layer is semiconducting in the 10-3-8 phase but
metallic in the 10-4-8 phase, leading to enhanced interlayer coupling in the
10-4-8 phase. The results suggest that metallic intermediary layers may offer a
new road to higher Tc in iron arsenide superconductors.

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The categories of this paper are: adap-org
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The categories of this paper are: gr-qc
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The categories of this paper are: eess
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The categories of this paper are: nlin
35
The categories of this paper are: mtrl-th
12
The categories of this paper are: nucl-th
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The categories of this paper are: nucl-ex
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The categories of this paper are: hep-ex
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The categories of this paper are: chem-ph
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The categories of this paper are: hep-lat
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The categories of this paper are: plasm-ph
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The categories of this paper are: hep-th
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The categories of this paper are: math-ph
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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: physics