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Science 21 November 1997:
Vol. 278. no. 5342, pp. 1412 - 1413
DOI: 10.1126/science.278.5342.1412
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Perspectives

Also see the archival list of Enhanced Perspectives

CONDENSED MATTER PHYSICS:
Enhanced: Quantum Magnetism and Its Many Avatars

Sudip Chakravarty

Magnetism and superconductivity are mysteriously intertwined in the cuprate materials that exhibit high transition temperatures. In his Perspective, Chakravarty discusses results published in two reports in the same issue; the report by Aeppli et al. describes experiments suggesting a novel state of matter related to a quantum critical point that gives rise to unusual magnetic behavior; the other by Blumberg et al. reports optical measurements of magnetic excitations in a bismuth cuprate superconductor. These results underline the complexity of magnetic physics in the cuprate materials.

The author is in the Department of Physics and Astronomy, University of California, Los Angeles, CA 90095-1547, USA. E-mail: sudip{at}physics.ucla.edu

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Science. ISSN 0036-8075 (print), 1095-9203 (online)