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Phys. Rev. Lett. 78, 713 - 716 (1997)

Superconductivity-Induced Anomalies in the Spin Excitation Spectra of Underdoped YBa2Cu3 O6+x

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H. F. Fong and B. Keimer
Department of Physics, Princeton University, Princeton, New Jersey 08544
and Brookhaven National Laboratory, Upton, New York 11973

D. L. Milius and I. A. Aksay
Department of Chemical Engineering, Princeton University, Princeton, New Jersey 08544

Received 23 August 1996

Polarized and unpolarized neutron scattering have been used to determine the effect of superconductivity on the magnetic excitation spectra of YBa2Cu3O6.5 (Tc  =  52  K) and YBa2Cu3O6.7 (Tc  =  67  K). Pronounced enhancements of the spectral weight centered around 25 and 33 meV, respectively, are observed below Tc 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.


©1997 The American Physical Society

URL: http://link.aps.org/doi/10.1103/PhysRevLett.78.713
DOI: 10.1103/PhysRevLett.78.713
PACS: 74.25.Jb, 74.25.Kc, 74.72.Bk

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