Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Odd and even magnetic resonant modes in highly overdoped Bi_2 Sr_2 Ca
  Cu_2 O_{8+delta}   We present inelastic neutron scattering data on highly overdoped Bi_2 Sr_2 Ca
Cu_2 O_{8+\delta} single crystals with superconducting transition temperature
T_C=70 K and, for comparison, a nearly optimally doped crystal with T_C=87 K.
In both samples, magnetic resonant modes with odd and even symmetry under
exchange of the two CuO_2 layers in the unit cell are observed. In the
overdoped sample, the linewidth of the odd mode is reduced compared with the
optimally doped sample. This finding is discussed in conjunction with recent
evidence for intrinsic inhomogeneities in this compound. The data on odd and
even resonant excitations are otherwise fully consistent with trends
established on the basis of data on YBa_2Cu_3O_{6+x}. This confirms the
universality of these findings and extends them into the highly overdoped
regime of the phase diagram.

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The categories of this paper are: hep-ph
25
The categories of this paper are: patt-sol
2
The categories of this paper are: math
37
The categories of this paper are: supr-con
21
The categories of this paper are: adap-org
6
The categories of this paper are: astro-ph
1
The categories of this paper are: cs
22
The categories of this paper are: chao-dyn
35
The categories of this paper are: mtrl-th
32
The categories of this paper are: atom-ph
16
The categories of this paper are: stat
18
The categories of this paper are: econ
33
The categories of this paper are: plasm-ph
30
The categories of this paper are: q-alg
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The categories of this paper are: quant-ph
28
The categories of this paper are: alg-geom