Quantum Magnetism and Its Many Avatars

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Science  21 Nov 1997:
Vol. 278, Issue 5342, pp. 1412-1413
DOI: 10.1126/science.278.5342.1412

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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.