Magnetic coherence in cuprate superconductors

Dirk K. Morr; David Pines

doi:10.1103/PhysRevB.61.R6483

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Magnetic coherence in cuprate superconductors

Dirk K. Morr, David Pines

DOI 10.1103/PhysRevB.61.R6483 · Physical Review B

T1

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Abstract

Recent inelastic-neutron-scattering experiments on La2−xSrxCuO4 observed a magnetic coherence effect, i.e., strong frequency- and momentum-dependent changes of the spin susceptibility, χ″, 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 La2−xSrxCuO4 which is closed around (π,π) up to optimal doping and (b) similar changes in χ″ for all cuprates with an incommensurate magnetic response.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
La2-xSrxCuO4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown
YBa2Cu3O6+x Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown