Physics – Condensed Matter – Superconductivity
Scientific paper
1994-11-02
Phys. Rev. B 51, 15478--15483 (1995)
Physics
Condensed Matter
Superconductivity
7 pages, REVTEX 3.0, 5 figures available upon request
Scientific paper
10.1103/PhysRevB.51.15478
We report measurements of the Gaussian contribution, T_{2G}, to the plane ^{63}Cu nuclear spin--spin relaxation time in the YBa_2Cu_3O_7 and YBa_2Cu_4O_8 blocks of normal and superconducting Y_2Ba_4Cu_7O_{15}. The data confirm our previous results that adjacent CuO_2 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 Y_2Ba_4Cu_7O_{15} data are incompatible with a phase diagram based on a single CuO_2 plane theory and suggest that the appearance of a spin gap implies interplane coupling. Additional data for YBa_2Cu_4O_8 and YBa_2Cu_3O_{6.982} are in accord with the single plane theory. -- The temperature dependence of T_{2G,ind} below T_c excludes isotropic s-wave superconductivity in all three compounds.
Brinkmann Daniel
Mali Mihael
Roos Johanna
Stern Raivo
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