Spin Correlations and Magnetic Order in Nonsuperconducting Nd_{2-x}Ce_xCuO_4

Preprint

4 July 2003

preprint
Published by arXiv in arXiv

Abstract

We report quantitative neutron scattering measurements of the evolution with doping of the antiferromagnetic correlations, the Neel temperature, and the ordered moment of non-superconducting Nd_{2-x}Ce_xCuO_4 (0 < x < 0.18). The instantaneous correlation length is well described by our quantum Monte-Carlo calculations for the randomly site-diluted nearest-neighbor S=1/2 square-lattice Heisenberg antiferromagnet. However, the itineracy of the charge carriers results in a relatively strong dopingdependence of the ordered moment, consistent with recent theory for the one-band Hubbard model and indicative of a possible quantum critical point well below the geometric site percolation threshold.

Keywords

ANTIFERROMAGNET
CE_XCUO_4
CRITICAL POINT
EVOLUTION
MONTE CARLO
NONSUPERCONDUCTING
ORDERED MOMENT
PERCOLATION THRESHOLD
SPIN CORRELATIONS
SUPERCONDUCTING

All Related Versions

Version 1, 2003-07-04, ArXiv
Version 2, 2003-11-01, ArXiv
Version 3, 2004-02-24, ArXiv
Version 4, 2004-05-13, ArXiv
Version 5, 2004-08-24, ArXiv
Published version: Physical Review Letters, 93 (2), 027002.

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