Quantum Impurities in the Two-Dimensional Spin One-Half Heisenberg Antiferromagnet

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 spi...

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Veröffentlicht in:	Science (American Association for the Advancement of Science) 2002-03, Vol.295 (5560), p.1691-1695
Hauptverfasser:	Vajk, O. P., Mang, P. K., Greven, M., Gehring, P. M., Lynn, J. W.
Format:	Artikel
Sprache:	eng
Schlagworte:	Analysis ANTIFERROMAGNETISM Black holes Condensed matter: electronic structure, electrical, magnetic, and optical properties Correlations Critical points Crystals Electromagnetism Encapsulation Exact sciences and technology General theory and models of magnetic ordering Heisenberg uncertainty principle IMPURITIES Liquids Magnetic properties and materials Magnetism PARTICLE ACCELERATORS Penrose process Physics Polymers Quantized spin models Quantum mechanics Quantum theory SPIN Spin arrangements in magnetically ordered materials (including neutron and spin-polarized electron studies, synchrotron-source x-ray scattering, etc.) STANFORD LINEAR ACCELERATOR CENTER STANFORD SYNCHROTRON RADIATION LABORATORY SYNCHROTRON RADIATION
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Beschreibung
Zusammenfassung:	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)zO 4is 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.
ISSN:	0036-8075 1095-9203
DOI:	10.1126/science.1067110