Report

Nearly Singular Magnetic Fluctuations in the Normal State of a High-Tc Cuprate Superconductor

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Science  21 Nov 1997:
Vol. 278, Issue 5342, pp. 1432-1435
DOI: 10.1126/science.278.5342.1432

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Abstract

Polarized and unpolarized neutron scattering was used to measure the wave vector– and frequency-dependent magnetic fluctuations in the normal state (from the superconducting transition temperature,T c = 35 kelvin, up to 350 kelvin) of single crystals of La1.86Sr0.14CuO4. The peaks that dominate the fluctuations have amplitudes that decrease asT −2 and widths that increase in proportion to the thermal energy, k B T(where k B is Boltzmann's constant), and energy transfer added in quadrature. The nearly singular fluctuations are consistent with a nearby quantum critical point.

  • * To whom correspondence should be addressed. E-mail: thom.mason{at}utoronto.ca

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