Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Spin density wave and pseudogap in HTSC cuprates   The evidence for the spin density wave (SDW) nature of the pseudogap in HTSC
cuprates is presented from resistive and direct gap measurements (ARPES,
tunneling experiments, etc.). Its d-wave symmetry mimics the symmetry of the
order parameter measured in the SC state. The magnetic phase $H-T$ diagram for
HTSC cuprates is formed. The possible influence of an additional (SDW) order
parameter on the vortex structure in the applied magnetic field is analysed.
The behavior is discussed in terms of itinerant electron systems with interplay
between superconductivity and magnetism.

13
The categories of this paper are: quant-ph
16
The categories of this paper are: stat
25
The categories of this paper are: patt-sol
37
The categories of this paper are: supr-con
0
The categories of this paper are: hep-ph
2
The categories of this paper are: math
6
The categories of this paper are: astro-ph
10
The categories of this paper are: q-bio
30
The categories of this paper are: q-alg
32
The categories of this paper are: atom-ph
14
The categories of this paper are: math-ph
11
The categories of this paper are: hep-lat
8
The categories of this paper are: hep-ex
33
The categories of this paper are: plasm-ph
15
The categories of this paper are: nucl-ex
29
The categories of this paper are: funct-an