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

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

1998-01-16

arxiv.org/abs/cond-mat/9801169v1

Science, Vol 278, 21 November 1997, 1432-1435

Physics

Condensed Matter

Strongly Correlated Electrons

5 pages, 4 color postscript figures

Scientific paper

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, up to 350 K) of single crystals of La_{1.86}Sr_{0.14}CuO_4. The peaks which dominate the fluctuations have amplitudes that decrease as T^{-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.

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