Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: NMR investigation of the pressure induced Mott transition to
  superconductivity in Cs3C60 isomeric compounds   The discovery in 1991 of high temperature superconductivity (SC) in A3C60
compounds, where A is an alkali ion, has been initially ascribed to a BCS
mechanism, with a weak incidence of electron correlations. However various
experimental evidences taken for compounds with distinct alkali content
established the interplay of strong correlations and Jahn Teller distortions of
the C60 ball. The importance of electronic correlations even in A3C60 has been
highlighted by the recent discovery of two expanded fulleride Cs3C60 isomeric
phases that are Mott insulators at ambient pressure. Both phases undergo a
pressure induced first order Mott transition to SC with a (p, T) phase diagram
displaying a dome shaped SC, a common situation encountered nowadays in
correlated electron systems. NMR experiments allowed us to establish that the
bipartite A15 phase displays N\'eel order at 47K, while magnetic freezing only
occurs at lower temperature in the fcc phase. NMR data do permit us to conclude
that well above the critical pressure, the singlet superconductivity found for
light alkalis is recovered. However deviations from BCS expectations linked
with electronic correlations are found near the Mott transition. So, although
SC involves an electron-phonon mechanism, correlations have a significant
incidence on the electronic properties, as had been anticipated from DMFT
calculations.

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The categories of this paper are: hep-ex
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The categories of this paper are: stat
31
The categories of this paper are: ao-sci
30
The categories of this paper are: q-alg
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The categories of this paper are: eess
36
The categories of this paper are: cmp-lg
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The categories of this paper are: math
3
The categories of this paper are: physics
32
The categories of this paper are: atom-ph
27
The categories of this paper are: comp-gas
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The categories of this paper are: hep-lat
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The categories of this paper are: astro-ph
10
The categories of this paper are: q-bio
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The categories of this paper are: quant-ph
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The categories of this paper are: adap-org
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The categories of this paper are: hep-th