Nearly Singular Magnetic Fluctuations in the Normal State of a High- T c Cuprate Superconductor
- 21 November 1997
- journal article
- other
- Published by American Association for the Advancement of Science (AAAS) in Science
- Vol. 278 (5342), 1432-1435
- https://doi.org/10.1126/science.278.5342.1432
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.Keywords
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