Spin pseudo-gap and interplane coupling in Y_2Ba_4Cu_7O_{15}: a ^{63}Cu nuclear spin-spin relaxation study

Abstract

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.

7 pages, REVTEX 3.0, 5 figures available upon request

References in corpus (4)

• Toward a Unified Magnetic Phase Diagram of the Cuprate Superconductors
• Spin Gaps and Spin Dynamics in La_{2-x}Sr_xCuO_4 and YBa_2Cu_3O7_δ
• Spin Gaps and Bilayer Coupling in YBa${}_2$Cu${}_3$O${}_{7-\delta }$ and YBa${}_2$Cu${}_4$O${}_8$
• Quantum Disordered Regime and Spin Gap in the Cuprate Superconductors

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• Effects of intrabilayer coupling on the magnetic properties of YBa${}_2$Cu${}_3$O${}_6$
• Admixture of an s-wave component to the d-wave gap symmetry in high-temperature superconductors
• Upper Pseudogap Phase: Magnetic Characterizations
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• Oxygen Isotope Effect of the Plane-Copper NQR Frequency in YBa_2Cu_4O_8
• Anisotropy of the antiferromagnetic spin correlations in the superconducting state of YBa_2Cu_3O_7 and YBa_2Cu_4O_8
• Interplane magnetic coupling effects in the multilattice compound Y_2Ba_4Cu_7O_{15}
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