Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Magneto-elastic Polarons and Superconductivity of Underdoped Cuprates
  HTS's   It is discussed some problems of normal states of high temperature
superconductors (HTS's) with d-wave pairing and next suppositions: 1) at
pseudogap temperature it occurs the dimensional crossover from 3D incoherent
normal state to quasi 2D system of Cu O2 layers; 2) "naked holes" are bed
quasiparticles for system with Janh-Teller and mixed valent Cu ions, strong
electron correlations and fluctuations, and inherent strong p-d hybridization
of copper and oxygen orbitals; 3) this leads to reducing of "naked holes" to
two types of magneto-elastic polarons. It is shown that one of them,
ferromagnetic bound polarons, lead to the formation of the stripes, and the
attraction between antiferromagnetic polarons lead to their pairing and to
superconducting fluctuations in plane. Some experimental evidences of the
observation of ferromagnetic bound polarons and of antiferromagnetic bipolarons
are discussed.

3
The categories of this paper are: physics
27
The categories of this paper are: comp-gas
1
The categories of this paper are: cs
30
The categories of this paper are: q-alg
8
The categories of this paper are: hep-ex
36
The categories of this paper are: cmp-lg
37
The categories of this paper are: supr-con
35
The categories of this paper are: mtrl-th
25
The categories of this paper are: patt-sol
18
The categories of this paper are: econ
10
The categories of this paper are: q-bio
0
The categories of this paper are: hep-ph
19
The categories of this paper are: eess
32
The categories of this paper are: atom-ph
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The categories of this paper are: hep-lat
13
The categories of this paper are: quant-ph