New magnetic coherence effect in superconducting La2-xSrxCuO4

Abstract

We have used inelastic neutron scattering to examine the magnetic fluctuations at intermediate frequencies in the simplest high temperature superconductor, La2-xSrxCu4. The suppression of the low energy magnetic response in the superconducting state is accompanied by an increase in the response at higher energies. Just above a threshold energy of ~7 meV there is additional scattering present below Tc which is characterised by an extraordinarily long coherence length, in excess of 50 .

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