Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Critical point and the nature of the pseudogap of single-layered
  copper-oxide Bi$_{2}$Sr$_{2-x}$La$_{x}$CuO$_{6+\delta}$ superconductors   We apply strong magnetic fields of H=28.5 \sim 43 T to suppress
superconductivity (SC) in the cuprates Bi_{2}Sr_{2-x}La_xCuO_{6+\delta}
(x=0.65, 0.40, 0.25, 0.15 and 0), and investigate the low temperature (T)
normal state by ^{63}Cu nuclear spin-lattice relaxation rate (1/T_1)
measurements. We find that the pseudogap (PG) phase persists deep inside the
overdoped region but terminates at x \sim 0.05 that corresponds to the hole
doping concentration of approximately 0.21. Beyond this critical point, the
normal state is a Fermi liquid characterized by the T_1T=const relation. A
comparison of the superconducting state with the H-induced normal state in the
x=0.40 (T_c = 32 K) sample indicates that there remains substantial part of the
Fermi surface even in the fully-developed PG state, which suggests that the PG
and SC are coexisting matters.

15
The categories of this paper are: nucl-ex
22
The categories of this paper are: chao-dyn
18
The categories of this paper are: econ
34
The categories of this paper are: chem-ph
21
The categories of this paper are: adap-org
27
The categories of this paper are: comp-gas
20
The categories of this paper are: acc-phys
17
The categories of this paper are: q-fin
6
The categories of this paper are: astro-ph
9
The categories of this paper are: nlin
25
The categories of this paper are: patt-sol
35
The categories of this paper are: mtrl-th
33
The categories of this paper are: plasm-ph
29
The categories of this paper are: funct-an
1
The categories of this paper are: cs
28
The categories of this paper are: alg-geom