Spin dynamics in the metallic state of the high-Tc superconducting system YBa2Cu3O6 + x

Strong-coupling analysis of scanning tunneling spectra in Bi2Sr2Ca2CuBerthod1, Fasano2, Maggio-Aprile3 et al. 2013Phys. Rev. B

“…8(b) corresponds well to the doping evolution observed by neutron scattering in Y-123, where the spin-resonance energy decreases from ∼40 meV at optimal doping to ∼25 meV in underdoped samples. 79,80 In Bi-2212, the resonance is found at 42 meV at optimal doping, and goes down to 34 meV with strong overdoping, 21 but no data have been reported in the underdoped region. Without neutron scattering data for Bi-2223, and considering the large variance of s for p > 45 meV, it is difficult to ascertain whether the decrease of the spin-resonance energy for large gaps is as sudden as suggested by our fits, or rather more continuous.…”

Effect of the magnetic resonance on the electronic spectra ofhigh−Tcsuperconductors

“…The momentum width of the spin fluctuation spectrum is minimal at the resonance energy, 42,54 where it is (in contrast to the off-resonant momentum width) only weakly doping dependent, with a full width of about 0.22 A −1 . 54,55,56 This corresponds to a correlation length ξ sf l of about two lattice spacings.…”

Fourier-transformed local density of states and tunneling into ad-wave superconductor with bosonic modes

“…21,22,23,24,25,26,27,28,29 As seen by inelastic neutron scattering experiments in most of the cuprates, 30,31,32,33,34,35,36,37,38,39,40,41,42,43,44,45 the spin mode intensity substantially turns on below T c (even though some intensity might be present in a normal state) and has a well-defined momentum of (π, π). This scenario of the electronic coupling to spin resonance mode has also been used to explain the tunneling spectra in planar tunnel junctions.…”