1998/01/16 by G. Aeppli, T. E. Mason, S. M. Hayden +2
Physics and Astronomy · #cond-mat.str-el #cond-mat.supr-con
published as Science, Vol 278, 21 November 1997, 1432-1435 · 5 pages, 4 color postscript figures
arxiv created 1998/01/16 · arxiv updated 2009/11/30
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, up to 350 K) of single crystals of La1.86Sr0.14CuO4. The peaks which dominate the fluctuations have amplitudes that decrease as T-2 and widths that increase in proportion to the thermal energy, kB T (where kB is Boltzmann's constant), and energy transfer added in quadrature. The nearly singular fluctuations are consistent with a nearby quantum critical point.