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

G. Aeppli (NEC Research); H.A. Mook (Oak Ridge National Laboratory); J. Kulda (Institut Laue Langevin); S.M. Hayden (University of Bristol); T.E. Mason (University of Toronto)

arxiv: cond-mat/9801169 · v1 · submitted 1998-01-16 · ❄️ cond-mat.str-el · cond-mat.supr-con

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

G. Aeppli (NEC Research) , T.E. Mason (University of Toronto) , S.M. Hayden (University of Bristol) , H.A. Mook (Oak Ridge National Laboratory) , J. Kulda (Institut Laue Langevin) This is my paper

classification ❄️ cond-mat.str-el cond-mat.supr-con

keywords fluctuationsenergymagneticnearlynormalsingularstateadded

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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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