@article{121221,
  author = {H. F. Fong and B. Keimer and D. L. Milius and I.A. Aksay},
  title = {Superconductivity-induced anomalies in the spin excitation spectra of underdoped YBa2Cu3O6+x},
  abstract = { Polarized and unpolarized neutron scattering have been used to determine the effect of superconductivity on the magnetic excitation spectra of YBa2Cu3O6.5 (T-c = 52 K) and YBa2Cu3O6.7 (T-c = 67 K); Pronounced enhancements of the spectral weight centered around 25 and 33 meV, respectively; are observed below T-c in both crystals, compensated predominantly by a loss of spectral weight at higher energies. The data provide important clues to the origin of the 40 meV magnetic resonance peak in YBa2Cu3O7. },
  year = {1997},
  journal = {Physical Review Letters},
  volume = {78},
  pages = {713-716},
  month = {01/1997},
  isbn = {0031-9007},
  language = {eng},
}