Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Kinetic energy driven superconductivity in the electron doped cobaltate
  Na$_{x}$CoO$_{2}\cdot y$H$_{2}$O   Within the charge-spin separation fermion-spin theory, we have shown that the
mechanism of superconductivity in the electron doped cobaltate
Na$_{x}$CoO$_{2}\cdot y$H$_{2}$O is ascribed to its kinetic energy. The dressed
fermions interact occurring directly through the kinetic energy by exchanging
magnetic excitations. This interaction leads to a net attractive force between
dressed fermions, then the electron Cooper pairs originating from the dressed
fermion pairing state are due to the charge-spin recombination, and their
condensation reveals the superconducting ground state. The superconducting
transition temperature is identical to the dressed fermion pair transition
temperature, and is suppressed to a lower temperature due to the strong
magnetic frustration. The optimal superconducting transition temperature occurs
in the electron doping concentration $\delta\approx 0.29$, and then decreases
for both underdoped and overdoped regimes, in qualitative agreement with the
experimental results.

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The categories of this paper are: acc-phys
7
The categories of this paper are: hep-th
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The categories of this paper are: math-ph
9
The categories of this paper are: nlin
2
The categories of this paper are: math
6
The categories of this paper are: astro-ph
26
The categories of this paper are: bayes-an
17
The categories of this paper are: q-fin
32
The categories of this paper are: atom-ph
15
The categories of this paper are: nucl-ex
12
The categories of this paper are: nucl-th
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The categories of this paper are: chao-dyn
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The categories of this paper are: econ
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The categories of this paper are: adap-org
3
The categories of this paper are: physics
34
The categories of this paper are: chem-ph