Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Origin and roles of a strong electron-phonon interaction in cuprate
  oxide superconductors   A strong electron-phonon interaction arises from the modulation of the
superexchange interaction by lattice vibrations. It is responsible for the
softening of the half-breathing modes around (pm pi/a,0) and (0, pm pi/a) in
the two-dimensional Brillouin zone, with a being the lattice constant of CuO_2
planes, as is studied in Phys. Rev. B70, 184514 (2004). Provided that
antiferromagnetic spin fluctuations are developed around Q=(pm 3 pi/4a, pm
pi/a) and (pm pi/a, pm 3 pi/4a), the electron-phonon interaction can also cause
the softening of Cu-O bond stretching modes around 2Q, or around (pm pi/2a,0)
and (0, pm pi/2a). The softening around 2Q is accompanied by the development of
charge fluctuations corresponding to the so called 4a-period stripe or
4a*4a-period checker-board state. However, an observation that the 4a-period
modulating part or the 2Q part of the density of states is almost symmetric
with respect to the chemical potential contradicts a scenario that the
stabilization of a single-2Q or double-2Q charge density wave following the
complete softening of the 2Q bond stretching modes is responsible for the
ordered stripe or checker-board state. It is proposed that the stripe or
checker-board state is simply a single-Q or double-Q spin density wave, whose
second-harmonic effects can explain the observed almost symmetric 2Q part of
the density of states. The strong electron-phonon interaction can play no or
only a minor role in the occurrence of d gamma-wave superconductivity in
cuprate oxides.

12
The categories of this paper are: nucl-th
11
The categories of this paper are: hep-lat
23
The categories of this paper are: solv-int
29
The categories of this paper are: funct-an
8
The categories of this paper are: hep-ex
7
The categories of this paper are: hep-th
10
The categories of this paper are: q-bio
26
The categories of this paper are: bayes-an
3
The categories of this paper are: physics
28
The categories of this paper are: alg-geom
34
The categories of this paper are: chem-ph
1
The categories of this paper are: cs
35
The categories of this paper are: mtrl-th
21
The categories of this paper are: adap-org
36
The categories of this paper are: cmp-lg
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The categories of this paper are: eess