Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: NMR captures preformed Cooper pairs persisting far beyond Tc in organic
  superconductors   High critical temperature (high-Tc) superconductivity in copper oxides
emerges when Mott insulators are doped, and various unconventional properties
follow. Among them, a focus is the so-called pseudogap behaviour emerging above
Tc, which is discussed in association with competing orders, Fermi-arc and
preformed Cooper pairs. Besides doping, there is another way to generate
unconventional superconductivity from Mott insulators, that is, by bandwidth
control, which involves varying the particle's kinetic energy instead of
particle number. Here, working with layered organic superconductors through NMR
experiments, we uncover that in the non-doped case anomalous suppression of
spin excitations above Tc arises from the preformed Cooper pairs intertwined
with antiferromagnetic spin fluctuations and is not accompanied by complexities
of competing orders, unlike what is observed in copper oxides. On the verge of
the Mott localization of electrons, they preform Cooper pairs that persist up
to twice as high as Tc.

7
The categories of this paper are: hep-th
35
The categories of this paper are: mtrl-th
14
The categories of this paper are: math-ph
30
The categories of this paper are: q-alg
24
The categories of this paper are: dg-ga
26
The categories of this paper are: bayes-an
17
The categories of this paper are: q-fin
25
The categories of this paper are: patt-sol
0
The categories of this paper are: hep-ph
31
The categories of this paper are: ao-sci
27
The categories of this paper are: comp-gas
1
The categories of this paper are: cs
5
The categories of this paper are: gr-qc
9
The categories of this paper are: nlin
32
The categories of this paper are: atom-ph
8
The categories of this paper are: hep-ex