Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Pairing in the Presence of a Pseudogap   Evidence that the pseudogap (PG) in a near-optimally doped
Bi$_2$Sr$_2$CaCu$_2$O$_{8+\delta}$ sample destroys the BCS logarithmic pairing
instability [1] raises again the question of the role of the PG in the
high-temperature superconducting cuprates [2]. The elimination of the BCS
instability is consistent with the view that the PG competes with
superconductivity. However, as noted in [1], the onset of superconductivity
with a $T_c \sim 90$ K suggests an alternative scenario in which the PG
reflects the formation of short range pairing correlations. Here, we report
results obtained from a dynamic cluster quantum Monte Carlo approximation (DCA)
for a 2D Hubbard model and conclude that (1) the PG, like the
superconductivity, arises due to short-range antiferromagnetic correlations and
(2) contrary to the usual case in which the pairing instability arises from the
Cooper instability, here, the strength of the spin-fluctuations increases as
the temperature decreases leading to the pairing instability.

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The categories of this paper are: nucl-th
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The categories of this paper are: patt-sol
34
The categories of this paper are: chem-ph
21
The categories of this paper are: adap-org
37
The categories of this paper are: supr-con
1
The categories of this paper are: cs
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The categories of this paper are: hep-th
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The categories of this paper are: hep-ex
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The categories of this paper are: solv-int
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The categories of this paper are: math-ph
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The categories of this paper are: eess
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The categories of this paper are: physics
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The categories of this paper are: dg-ga
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The categories of this paper are: quant-ph
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The categories of this paper are: alg-geom
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The categories of this paper are: chao-dyn