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- N. B. Christensen
- *Materials Research Department, Risø National Laboratory, Technical University of Denmark, DK-4000 Roskilde, Denmark;
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- H. M. Rønnow
- Laboratory for Neutron Scattering, ETH Zurich and Paul Scherrer Institute, CH-5232 Villigen PSI, Switzerland;
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- D. F. McMorrow
- *Materials Research Department, Risø National Laboratory, Technical University of Denmark, DK-4000 Roskilde, Denmark;
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- A. Harrison
- **Department of Chemistry, University of Edinburgh, Edinburgh, EH9 3JJ, United Kingdom;
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- T. G. Perring
- ISIS Facility, Rutherford Appleton Laboratory, Chilton, Didcot OX11 0QX, United Kingdom;
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- M. Enderle
- Institut Laue-Langevin, 38042 Grenoble Cedex 9, France;
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- R. Coldea
- Oxford Physics, Clarendon Laboratory, Parks Road, Oxford OX1 3PU, United Kingdom;
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- L. P. Regnault
- CEA, Grenoble, Département de Recherche Fondamentale sur la Matière Condensée, 38054 Grenoble Cedex 9, France
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- G. Aeppli
- London Centre for Nanotechnology and Department of Physics and Astronomy, University College London, London WC1H 0AH, United Kingdom;
書誌事項
- 公開日
- 2007-09-25
- DOI
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- 10.1073/pnas.0703293104
- 公開者
- Proceedings of the National Academy of Sciences
この論文をさがす
説明
<jats:p>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.</jats:p>
収録刊行物
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- Proceedings of the National Academy of Sciences
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Proceedings of the National Academy of Sciences 104 (39), 15264-15269, 2007-09-25
Proceedings of the National Academy of Sciences