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Neutron scattering, magnetometry, and quantum Monte Carlo study of the randomly diluted spin-1/2 square-lattice Heisenberg antiferromagnet by O.P. Vajk; M. Greven; P.K. Mang; J.W. Lynn is a Physics and Astronomy article available to read on EtoBox.

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We have successfully grown sizable single crystals of La 2 Cu 12z (Zn,Mg) z O 4 with up to nearly half of the magnetic Cu sites replaced by non-magnetic Zn and Mg. Neutron scattering, SQUID magnetometry, and complementary quantum Monte Carlo (QMC) simulations demonstrate that this material is an excellent model system for the study of site percolation of the squarelattice Heisenberg antiferromagnet (SLHAF) in the quantum-spin limit S 1⁄4 1/2. Carefully oxygen-reduced samples exhibit Ne ́el order up to the percolation threshold for site dilution, z p < 40.7%. For z . 10%, the material exhibits a low-temperature tetragonal (LTT) structural phase, with a transition temperature that increases linearly with doping. Above z < 25%, Ne ́el order occurs in the LTT phase. Up to at least z 1⁄4 35%, the Ne ́el temperature T N (z ) of the experimental system corresponds to the temperature at which QMC indicates that the spin correlations for the nearest-neighbor S 1⁄4 1/2 SLHAF have grown to approximately 100 lattice constants. Neutron scattering measurements of the static structure factor in the paramagnetic regime allow the determination of the two-dimensional spin correlations, which are

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Author

O.P. Vajk; M. Greven; P.K. Mang; J.W. Lynn

Publisher

Elsevier Science; Elsevier ; Elsevier BV (ISSN 0038-1098)

Published

2003

Language

EN

Field

Physics and Astronomy (Physical Sciences)