New magnetic coherence effect in superconducting La_{2-x}Sr_{x}CuO_{4}
T.E. Mason (University of Toronto), A. Schroder (Risoe National Lab),, G. Aeppli (NEC Research), H.A. Mook (Oak Ridge), and S.M. Hayden (University, of Bristol)
TL;DR
This study reveals a new magnetic coherence effect in superconducting La_{2-x}Sr_{x}CuO_{4}, showing energy-dependent magnetic response changes and long-range coherence above a certain energy threshold.
Contribution
It uncovers a novel magnetic coherence phenomenon in high-temperature superconductor La_{2-x}Sr_{x}CuO_{4} using inelastic neutron scattering.
Findings
Suppression of low-energy magnetic response below T_c
Increase in higher-energy magnetic response in the superconducting state
Presence of long-range magnetic scattering above 7 meV
Abstract
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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