High Temperature Superconductors

NMR Studies of pseudogap and electronic inhomogeneity in Bi$_2$Sr$_2$CaCu$_2$O$_{8+δ}$

“…where χ"(ω, q) is the imaginary part of the electron spin susceptibility. 45,46 The hyperfine form factor F α (q) = 2C αα cos(q x,y a/2) filters out Cu spin fluctuations at Q = (π/a, π/a) because the oxygen is located symmetrically between the two coppers. 22,36 However recent neutron scattering studies on Bi 2 Sr 2 CaCu 2 O 8+δ have confirmed the presence of incommensurate spin excitations at wavevectors Q 0 = Q.…”

NMR studies of pseudogap and electronic inhomogeneity in Bi2Sr2CaCu2OCrocker1, Dioguardi2, apRoberts-Warren3 et al. 2011Phys. Rev. B

“…47,48 The hyperfine form factor F α (q) = 2C αα cos(q x,y a/2) filters out Cu spin fluctuations at Q = (π/a, π/a) because the oxygen is located symmetrically between the two coppers. 22,36 However recent neutron scattering studies on Bi 2 Sr 2 CaCu 2 O 8+δ have confirmed the presence of incommensurate spin excitations at wavevectors Q 0 = Q.…”