Quantum Impurities in the Two-Dimensional Spin One-Half Heisenberg Antiferromagnet
O. P. Vajk (1), P. K. Mang (1), M. Greven (1, 2), P. M. Gehring, (3), J. W. Lynn (3) ((1) Stanford University, (2) Stanford Synchrotron, Radiation Laboratory, (3) NIST Center for Neutron Research)
TL;DR
This paper investigates quantum impurities in a two-dimensional spin-1/2 Heisenberg antiferromagnet, using neutron scattering and numerical methods to understand impurity effects in a model system relevant to strongly correlated electrons.
Contribution
It demonstrates that La2Cu(1-z)(Zn,Mg)zO4 is an effective experimental model for studying quantum impurities in a 2D spin-1/2 antiferromagnet.
Findings
Quantitative data on ordered moments and spin correlations.
Validation of theoretical models for quantum impurity effects.
Confirmation of the material as a model for site percolation in quantum systems.
Abstract
The study of randomness in low-dimensional quantum antiferromagnets is at the forefront of research in the field of strongly correlated electron systems, yet there have been relatively few experimental model systems. Complementary neutron scattering and numerical experiments demonstrate that the spin-diluted Heisenberg antiferromagnet La2Cu(1-z)(Zn,Mg)zO4 is an excellent model material for square-lattice site percolation in the extreme quantum limit of spin one-half. Measurements of the ordered moment and spin correlations provide important quantitative information for tests of theories for this complex quantum-impurity problem.
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