The resonance peak in cuprate superconductors

Details The resonance peak in cuprate superconductors The resonance peak in cuprate superconductors

1998-05-09

arxiv.org/abs/cond-mat/9805107v1

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages, RevTeX, 3 eps figures embedded in the text

Scientific paper

10.1103/PhysRevLett.81.1086

We pursue the consequences of a theory in which the resonance peak observed in inelastic neutron scattering (INS) experiments on underdoped and optimally doped YBa$_2$Cu$_3$O$_{6+x}$ compounds arises from a spin-wave excitation. We find that it is heavily damped, and thus almost not observable, in the normal state, but becomes visible in the superconducting state due to the drastic decrease in spin damping. We show that a spin-fermion model correctly describes the temperature dependence of the peak position for YBa$_2$Cu$_3$O$_7$, as well as the doping dependence of the peak position and of the integrated intensity. We explain why no resonance peak has been observed in La$_{2-x}$Sr$_x$CuO$_4$, and make several predictions concerning resonance peaks in other cuprate superconductors.

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