Abstract
Static, dynamical spin correlations in high-Tc superconductor studied by neutron scattering are reviewed based on our recent work on hole-doped La2Cu04. Spin correlation in the superconducting phase exhibits a long period spatial modulation. The doping, temperature, energy dependences of the spin fluctuations revealed a concordant relation between the incommensurate dynamical spin correlation, superconductivity. No-well defined spin correlation exists beyond the upper critical doping of the superconducting phase. Below Tc, a well-defined energy-gap of ~7meV opens in the dynamical spin susceptibility for the optimally doped or slightly overdoped phases. In contrast, no well-defined energy-gap opens for the underdoped samples. In addition to the dynamical spin fluctuations, a long range incommensurate static magnetic order is observed around 1/8-doping in the superconducting states. For x=0.12, the onset temperature of the magnetic order is highest, corresponds to Tc.
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