Spin pseudo-gap and interplane coupling in Y2Ba4Cu7O15: a 63Cu nuclear spin-spin relaxation study
R. Stern, M. Mali, J. Roos, D. Brinkmann
Abstract
We report measurements of the Gaussian contribution, T2G, to the plane 63Cu nuclear spin--spin relaxation time in the YBa2Cu3O7 and YBa2Cu4O8 blocks of normal and superconducting Y2Ba4Cu7O15. The data confirm our previous results that adjacent CuO2 planes have different doping levels and that these planes are strongly coupled. -- The static spin susceptibility at the anti-ferromagnetic wave vector exhibits a Curie--Weiss like temperature dependence in the normal state. -- The Y2Ba4Cu7O15 data are incompatible with a phase diagram based on a single CuO2 plane theory and suggest that the appearance of a spin gap implies interplane coupling. Additional data for YBa2Cu4O8 and YBa2Cu3O6.982 are in accord with the single plane theory. -- The temperature dependence of T2G,ind below Tc excludes isotropic s-wave superconductivity in all three compounds.
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