Abstract
Abstract Neutron scattering has played a crucial role in elucidating the phase diagram of the prototypical high-tem-perature superconductor La2-xSrxCuO4 (see Figure 1). The commensurate antiferromagnetic order that is present in the undoped compound is destroyed by a hole concentration (given by x) of 0.02 [l]. At higher hole concentrations (x > 0.05), where high-temperature superconductivity occurs, dynamical two-dimensional spin correlations characterized by an incommensurate wave vector (see Figure 2a) have been detected [2–4]. Further studies have clarified the momentum, energy and temperature dependencies of these excitations [5–8]; nevertheless, their underlying nature and the cause of the incommensurability have not been firmly established.
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