Only recently has it become clear that quantum fluctuations do not destroy long-range oreder in the ground state of the 2D S = 1 2 square-lattice Heisenberg antiferromagnet. We reporta neutron scattering study of the static structure factor of Su2CuO2Cl2, which is an optimal experimental realization of this model. Excellent agreement for the magnetic correlation length is found to exist between theory. Monte Carlo results and our experiment.
Bibliographical noteFunding Information:
We would like to thank S. Chakravarty, B.I. Halperin, D.C. Johnston, S.K. Sinha and U.-J. Wiese for helpful discussions. This work was supported by the US -Japan Cooperative Neutron Scattering Program. The work at Tohoku University was supported by Grant-In-Aid for Scientific Research from the Japanese Ministry of Education, Science and Culture. The work at BNL was supported by the division of Materials Science. the Office of Basic Energy Science of the US Department of Energy, under contract No. DE-AC02-76CH00016. The work at MIT was supported by the US National Science Foundation under Contracts No. DMR 90-22933 and DMR 90-07825.