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Science 21 November 1997:
Vol. 278. no. 5342, p. 1377
DOI: 10.1126/science.278.5342.1377l
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Although high-temperature superconductivity is the hallmark of layered cuprate compounds, their normal insulating state exhibits unusual charge behavior. Aeppli et al. have used inelastic magnetic neutron scattering to show that the normal state of the superconductor La1.86Sr0.14CuO4 is also unusual in terms of spin behavior. Magnetic fluctuations are observed that indicate the presence of a quantum critical point at zero temperature. [See the Perspective by Chakravarty.]

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