The magnetic properties of non-superconducting Nd2-xCe xCuO4±δ were studied using neutron scattering methods. It was stated that using Monte Carlo methods it was possible to describe the instantaneous correlation length for the randomly site-diluted nearest neighbor spin-1/2 square-lattice Heisenberg antiferromagnet. It was found that the effect of quantum fluctuations was strong on the ordered moment, which decreases more rapidly than for quenched-disorder model. Phonon anomalies were observed in both electron hole-doped high-temperature superconductors.
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We acknowledge valuable discussions with N. P. Armitage, S. Larochelle, R. S. Markiewicz, M. Matsuda, and A.-M. S. Tremblay, and we thank I. Tanaka and the late H. Kojima for their invaluable assistance during ?>the initial stage of the crystal growth effort. This work was supported by the U.S. Department of Energy ?>under Contracts No. DE-FG03-99ER45773 and No. DE-AC03-76SF00515 and by NSF CAREER Award No. DMR9985067.