High-energy spin excitations in YBa2Cu3O6.5

نویسندگان

  • P. Bourges
  • H. F. Fong
  • L. P. Regnault
  • I. A. Aksay
چکیده

Inelastic neutron scattering has been used to obtain a comprehensive description of the absolute dynamical spin susceptibility x9(q,v) of the underdoped superconducting cuprate YBa2Cu3O6.5 (Tc552 K! over a wide range of energies and temperatures ~2 meV <\v< 120 meV and 5 K<T<200 K!. Spin excitations of two distinct symmetries ~even and odd under the exchange of two adjacent CuO2 layers! are observed which exhibit two different gaplike features ~rather than a single ‘‘spin pseudogap’’!. The excitations show dispersive behavior at high energies. @S0163-1829~97!51142-8#

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تاریخ انتشار 1997