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Antiferromagnetic spin fluctuations in superconducting YBa₂{Cu}₃O₆₊ₓ have been studied using inelastic neutron scattering. In a crystal with x=0.5 and Tc=50 K, we have observed spin fluctuations at 12 K having a cross section which increases with increasing excitation energy. The data are consistent with highly overdamped spin waves and a very short spin-spin correlation length.
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Tranquada et al. (1990) studied this question.
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