Superconductivity-Induced Anomalies in the Spin Excitation Spectra of Underdoped YBa₂ Cu₃ O₆₊ₓ
Fong, H. F. · Keimer, B. · Milius, D. L. · Aksay, I. A.
Original · EN
Polarized and unpolarized neutron scattering has been used to determine the effect of superconductivity on the magnetic excitation spectra of YBa₂ Cu₃ O₆.₅ (Tc = 52K) and YBa₂ Cu₃ O₆.₇ (Tc = 67K). Pronounced enhancements of the spectral weight centered around 25 meV 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 YBa₂ Cu₃ O₇.
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