Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: $Sr Cu_2 (BO_3)_2$: A Unique Mott Hubbard Insulator   We discuss the recently discovered system $Sr Cu_2 (BO_3)_2$, a realization
of an exactly solvable model proposed two decades earlier. We propose its
interpretation as a Mott Hubbard insulator. The possible superconducting phase
arising from doping is explored, and its nature as well as its importance for
testing the RVB theory of superconductivity are discussed.

9
The categories of this paper are: nlin
14
The categories of this paper are: math-ph
0
The categories of this paper are: hep-ph
37
The categories of this paper are: supr-con
18
The categories of this paper are: econ
25
The categories of this paper are: patt-sol
12
The categories of this paper are: nucl-th
32
The categories of this paper are: atom-ph
16
The categories of this paper are: stat
27
The categories of this paper are: comp-gas
23
The categories of this paper are: solv-int
33
The categories of this paper are: plasm-ph
19
The categories of this paper are: eess
35
The categories of this paper are: mtrl-th
11
The categories of this paper are: hep-lat
36
The categories of this paper are: cmp-lg