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Spin Correlations and Magnetic Order in Nonsuperconducting Nd_{2-x}Ce_xCuO_{4\pm\delta}

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arxiv cond-mat/0307093 v5 pith:YJ2JKY2B submitted 2003-07-04 cond-mat.supr-con cond-mat.str-el

P.K. Mang , O.P. Vajk , A. Arvanitaki , J.W. Lynn , M. Greven This is my paper · ORCID
classification cond-mat.supr-concond-mat.str-el
keywords correlationsdeltamomentnonsuperconductingorderedquantumxcuoantiferromagnet
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abstract

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.

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