Science · 1997 · 286 citations · 8 references
Natural SciencesPhysicsCondensed Matter PhysicsMagnetic MaterialsSolid State PhysicsMagnetic Properties Of SolidsMagnetism In SolidsPhase TransitionsStates Of MatterStrongly Correlated Electron SystemsSuperconducting MaterialsEnergy TransferHigh-temperature SuperconductivityPhase Transition TemperaturePolarized Neutron ScatteringQuantum CriticalitySpin FluctuationsSuperconducting Critical TemperatureSuperconducting Phase Transitions
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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Evidence for stripe correlations of spins and holes in copper oxide superconductors
J. M. Tranquada, B. J. Sternlieb, J. D. Axe et al. · Nature · 1995 · 3.2K citations
Phenomenology of the normal state of Cu-O high-temperature superconductors
C. M. Varma, P. B. Littlewood, S. Schmitt‐Rink et al. · Physical Review Letters · 1989 · 2.2K citations · Full text