High energy spin excitations in YBa_2 Cu_3 O_{6.5}

Details High energy spin excitations in YBa_2 Cu_3 O_{6.5} High energy spin excitations in YBa_2 Cu_3 O_{6.5}

1997-04-09

arxiv.org/abs/cond-mat/9704073v2

Phys. Rev. B, 56, R11439 (1997)

Physics

Condensed Matter

Superconductivity

15 pages, 5 figures

Scientific paper

10.1103/PhysRevB.56.R11439

Inelastic neutron scattering has been used to obtain a comprehensive description of the absolute dynamical spin susceptibility $\chi'' (q,\omega)$ of the underdoped superconducting cuprate YBa_2 Cu_3 O_{6.5} ($T_c = 52 K$) over a wide range of energies and temperatures ($2 meV \leq \hbar \omega \leq 120 meV$ and $5K \leq T \leq 200K$). Spin excitations of two different symmetries (even and odd under exchange of two adjacent CuO_2 layers) are observed which, surprisingly, are characterized by different temperature dependences. The excitations show dispersive behavior at high energies.

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