Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: On the theory of high temperature superconductivity   We deal with a model for high-temperature superconductivity which maintains
that in cuprates spin-singlet bonds are formed between electrons running in the
neighbouring layers of copper oxide found in lattice of these materials. This
model reutilizes the BCS scheme, but with the essential difference that the
electron pairs are characterized by equal, rather than opposite, momenta as in
Cooper pairs. In the present paper, we consider the electron pair formation and
a peculiar canonical transformation analogous to the transformation once
applied to the theory of pairing correlations in nuclear matter. It is shown
that the quasi-particle energy spectrum remains that of the BCS theory,
including the linear relationship between forbidden energy gap and critical
temperature. The model is also applied to superconductivity of some copperless
perovskites of mixed stoichiometry, whose features are of special worth in
understanding the mechanism of the phenomenon. The possibility of enhancing
critical temperature in cuprates by inserting monovalent ions into the lattice
is considered

20
The categories of this paper are: acc-phys
0
The categories of this paper are: hep-ph
22
The categories of this paper are: chao-dyn
33
The categories of this paper are: plasm-ph
23
The categories of this paper are: solv-int
17
The categories of this paper are: q-fin
14
The categories of this paper are: math-ph
29
The categories of this paper are: funct-an
31
The categories of this paper are: ao-sci
27
The categories of this paper are: comp-gas
3
The categories of this paper are: physics
37
The categories of this paper are: supr-con
13
The categories of this paper are: quant-ph
9
The categories of this paper are: nlin
19
The categories of this paper are: eess
2
The categories of this paper are: math