Nearly singular magnetic fluctuations in the normal state of a high-Tc cuprate superconductor |
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Authors: | G Aeppli TE Mason SM Hayden HA Mook J Kulda |
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Institution: | G. Aeppli, NEC Research Institute, 4 Independence Way, Princeton, NJ 08540, USA, and Riso National Laboratory, 4000 Roskilde, Denmark. T. E. Mason, Department of Physics, University of Toronto, Toronto, Canada, M5S 1A7 and Riso National Laboratory, |
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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, Tc = 35 kelvin, up to 350 kelvin) of single crystals of La1.86Sr0.14CuO4. The peaks that dominate the fluctuations have amplitudes that decrease as T-2 and widths that increase in proportion to the thermal energy, kBT (where kB is Boltzmann's constant), and energy transfer added in quadrature. The nearly singular fluctuations are consistent with a nearby quantum critical point. |
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