Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Magnetic excitations and phonons simultaneously studied by resonant
  inelastic x-ray scattering in optimally doped
  Bi$_{1.5}$Pb$_{0.55}$Sr$_{1.6}$La$_{0.4}$CuO$_{6+\delta}$   Magnetic excitations in the optimally doped high-$T_\mathrm{c}$
superconductor Bi$_{1.5}$Pb$_{0.55}$Sr$_{1.6}$La$_{0.4}$CuO$_{6+\delta}$
(OP-Bi2201, $T_\mathrm{c}\simeq 34$ K) are investigated by Cu $L_3$ edge
resonant inelastic x-ray scattering (RIXS), below and above the pseudogap
opening temperature. At both temperatures the broad spectral distribution
disperses along the (1,0) direction up to $\sim$350~meV at zone boundary,
similarly to other hole-doped cuprates. However, above $\sim$0.22 reciprocal
lattice units, we observe a concurrent intensity decrease for magnetic
excitations and quasi-elastic signals with weak temperature dependence. This
anomaly seems to indicate a coupling between magnetic, lattice and charge modes
in this compound. We also compare the magnetic excitation spectra near the
anti-nodal zone boundary in the single layer OP-Bi2201 and in the bi-layer
optimally doped Bi$_{1.5}$Pb$_{0.6}$Sr$_{1.54}$CaCu$_2$O$_{8+\delta}$
(OP-Bi2212, $T_\mathrm{c}\simeq96$ K). The strong similarities in the
paramagnon dispersion and in their energy at zone boundary indicate that the
strength of the super-exchange interaction and the short-range magnetic
correlation cannot be directly related to $T_\mathrm{c}$, not even within the
same family of cuprates.

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The categories of this paper are: eess
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The categories of this paper are: dg-ga
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The categories of this paper are: quant-ph
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The categories of this paper are: stat
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The categories of this paper are: patt-sol
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The categories of this paper are: hep-th
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The categories of this paper are: math
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The categories of this paper are: solv-int
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The categories of this paper are: q-bio
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The categories of this paper are: hep-ex
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The categories of this paper are: funct-an
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The categories of this paper are: supr-con
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The categories of this paper are: alg-geom
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The categories of this paper are: comp-gas
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The categories of this paper are: econ
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The categories of this paper are: chem-ph