Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Odd-frequency superconductivity in Sr$_2$RuO$_4$ measured by Kerr
  rotation   We establish the existence of bulk odd-frequency superconductivity in
Sr$_2$RuO$_4$ and show that an intrinsic Kerr effect is a direct evidence of
this state. We use both general two- and three-orbital models, as well as a
realistic tight-binding description of Sr$_2$RuO$_4$ to demonstrate that
odd-frequency pairing arises due to finite hybridization between different
orbitals in the normal state, and is further enhanced by finite inter-orbital
pairing.

14
The categories of this paper are: math-ph
24
The categories of this paper are: dg-ga
12
The categories of this paper are: nucl-th
27
The categories of this paper are: comp-gas
18
The categories of this paper are: econ
20
The categories of this paper are: acc-phys
21
The categories of this paper are: adap-org
19
The categories of this paper are: eess
32
The categories of this paper are: atom-ph
1
The categories of this paper are: cs
7
The categories of this paper are: hep-th
11
The categories of this paper are: hep-lat
15
The categories of this paper are: nucl-ex
31
The categories of this paper are: ao-sci
26
The categories of this paper are: bayes-an
2
The categories of this paper are: math