Abstract
K. R. Thurber, A. W. Hunt, T. Imai, F. C. Chou, and Y. S. Lee Center for Materials Science and Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139 (Received 31 July 1996; revised manuscript received 17 March 1997) Using 17O NMR, we probed the short wavelength excitations in the CuO2 planes of insulating and weakly metallic high Tc cuprates. We measured the spin wave damping for an S 1y2 2D quantum Heisenberg antiferromagnet for the first time. The results establish the nearly free behavior (asymptotic freedom) of the high energy spin waves, even without long range magnetic order. Light hole doping dramatically enhances the low energy excitation spectrum below 300 K. [S0031-9007(97)03483-2]
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