Magnetic coherence in cuprate superconductors
- University of Illinois at Urbana-Champaign, Loomis Laboratory of Physics, 1110 West Green Street, Urbana, Illinois 61801 (United States)
Recent inelastic-neutron-scattering experiments on La{sub 2-x}Sr{sub x}CuO{sub 4} observed a magnetic coherence effect, i.e., strong frequency- and momentum-dependent changes of the spin susceptibility, {chi}{sup ''}, in the superconducting phase. We show that this effect is a direct consequence of changes in the damping of incommensurate antiferromagnetic spin fluctuations due to the appearance of a d-wave gap in the fermionic spectrum. Our theoretical results provide a quantitative explanation for the weak momentum dependence of the observed spin gap. Moreover, we predict (a) a Fermi surface in La{sub 2-x}Sr{sub x}CuO{sub 4} which is closed around ({pi},{pi}) up to optimal doping and (b) similar changes in {chi}{sup ''} for all cuprates with an incommensurate magnetic response. (c) 2000 The American Physical Society.
- OSTI ID:
- 20215625
- Journal Information:
- Physical Review. B, Condensed Matter and Materials Physics, Vol. 61, Issue 10; Other Information: PBD: 1 Mar 2000; ISSN 1098-0121
- Country of Publication:
- United States
- Language:
- English
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