Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2007-09-23
Proc. Natl. Acad. Sci. U.S.A., Vol. 104 (39), pp. 15264-15269 (2007). Available at http://www.pnas.org/cgi/doi/10.1073/pnas.07
Physics
Condensed Matter
Strongly Correlated Electrons
26 pages, 6 figures
Scientific paper
10.1073/pnas.0703293104
Bulk magnetism in solids is fundamentally quantum mechanical in nature. Yet in many situations, including our everyday encounters with magnetic materials, quantum effects are masked, and it often suffices to think of magnetism in terms of the interaction between classical dipole moments. Whereas this intuition generally holds for ferromagnets, even as the size of the magnetic moment is reduced to that of a single electron spin (the quantum limit), it breaks down spectacularly for antiferromagnets, particularly in low dimensions. Considerable theoretical and experimental progress has been made in understanding quantum effects in one-dimensional quantum antiferromagnets, but a complete experimental description of even simple two-dimensional antiferromagnets is lacking. Here we describe a comprehensive set of neutron scattering measurements that reveal a non-spin-wave continuum and strong quantum effects, suggesting entanglement of spins at short distances in the simplest of all two-dimensional quantum antiferromagnets, the square lattice Heisenberg system.
Aeppli Gabriel
Christensen Niels B.
Coldea Radu
Enderle Mechthild
Harrison Albert A.
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