Physics – Condensed Matter – Superconductivity
Scientific paper
2003-07-04
Phys. Rev. Lett. 93, 027002 (2004)
Physics
Condensed Matter
Superconductivity
4 pages, 3 figures, text updated to match published version
Scientific paper
10.1103/PhysRevLett.93.027002
We report quantitative neutron scattering measurements of the evolution with doping of the N\'eel temperature, the antiferromagnetic correlations, and the ordered moment of as-grown, nonsuperconducting Nd_{2-x}Ce_xCuO_{4\pm\delta} ($0 \le x \le 0.18$). The instantaneous correlation length can be effectively described by our quantum Monte Carlo calculations for the randomly site-diluted nearest-neighbor spin-1/2 square-lattice Heisenberg antiferromagnet. However, quantum fluctuations have a stronger effect on the ordered moment, which decreases more rapidly than for the quenched-disorder model.
Arvanitaki Asimina
Greven Martin
Lynn Jacob W.
Mang P. K.
Vajk O. P.
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