New magnetic coherence effect in superconducting La_{2-x}Sr_{x}CuO_{4}

Details New magnetic coherence effect in superconducting La_{2-x}Sr_{x}CuO_{4} New magnetic coherence effect in superconducting La_{2-x}Sr_{x}CuO_{4}

1996-06-12

arxiv.org/abs/cond-mat/9606084v2

Physical Review Letters, Volume 77, pp 1604-1607 (1996)

Physics

Condensed Matter

11 pages, RevTeX, 4 postscript figures

Scientific paper

10.1103/PhysRevLett.77.1604

We have used inelastic neutron scattering to examine the magnetic fluctuations at intermediate frequencies in the simplest high temperature superconductor, La_{2-x}Sr_{x}Cu_{4}. 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 T_{c} which is characterised by an extraordinarily long coherence length, in excess of 50 \AA.

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