Bw. Statt et al., INTERLAYER COUPLING IN THE SUPERCONDUCTING STATE OF BI2SR2CA2CU3O10, Physical review. B, Condensed matter, 55(17), 1997, pp. 11122-11125
Spin echo double resonance has been used to detect the spin-spin coupl
ing between Cu spins on adjacent CuO2 layers. These measurements, perf
ormed in the superconducting state, on the three-layer Pb-doped bismut
h high-ir, compound demonstrate the existence of interlayer exchange c
oupling as well as interlayer correlations in the quasiparticle excita
tions. An estimate of the interlayer exchange constant J(perpendicular
to) is found to be 43 K, 3% of the intralayer value.