Abstract
In the lamellar copper oxide superconductors, magnetic phenomena play a fundamental role. Pure La2CuO4 is a nearly ideal realization of the two-dimensional, S= 1/2 Heisenberg model, a system of basic interest in statistical physics. Doping with holes has a dramatic effect on the Cu2+-Cu2+ spin correlations. A hole concentration of 2% is sufficient to destroy the Néel state and to produce a novel spin-glass phase. In this talk we will review the results of a series of neutron-scattering studies of the static and dynamic spin fluctuations in the antiferromagnetic, spin-glass, and superconducting regions of the La2−xSrxCuO4 phase diagram. Emphasis will be placed on recent results in the pure material La2CuO4 (Ref. 1) and in the superconductor La1.85Sr0.15CuO4.2 For a general review see Ref. 3.
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