Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Thermally induced gaplessness and Fermi arcs in a "s-wave" magnetic
  superconductor   An electron system with pre-existing local moments and an effective
electron-electron attraction can exhibit simultaneous magnetic and
superconducting order. Increasing the magnetic coupling weakens pairing and the
ground state loses superconductivity at a critical coupling. In the vicinity of
the critical coupling magnetic order dramatically modifies the quasiparticle
dispersion in the superconductor, creating low energy spectral weight and
significant gap anisotropy in the notional 's-wave' state. Using a Monte Carlo
approach to the Hubbard-Kondo lattice problem we establish a thermal phase
diagram, for varying magnetic coupling, that corresponds qualitatively to the
borocarbide superconductors. In addition to the superconducting and magnetic
transition temperatures, we identify two new thermal scales in this nominal
s-wave system. These are associated, respectively, with crossover from gapped
to gapless superconductivity, and from an anisotropic (nodal) 'Fermi surface'
at low temperature, through a Fermi arc regime, to an isotropic Fermi surface
at high temperature. Some of the spectral effects are already visible in the Ho
and Er based borocarbides, others can be readily tested.

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The categories of this paper are: patt-sol
3
The categories of this paper are: physics
26
The categories of this paper are: bayes-an
37
The categories of this paper are: supr-con
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The categories of this paper are: alg-geom
31
The categories of this paper are: ao-sci
11
The categories of this paper are: hep-lat
0
The categories of this paper are: hep-ph
5
The categories of this paper are: gr-qc
22
The categories of this paper are: chao-dyn
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The categories of this paper are: adap-org
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The categories of this paper are: q-fin
33
The categories of this paper are: plasm-ph
9
The categories of this paper are: nlin
10
The categories of this paper are: q-bio
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The categories of this paper are: funct-an