NMR shift behavior of the planar Cu(1) site in the underdoped superconductor Hg0.8Re0.2Ba2Ca2 Cu3O8+y

J. H. Liversage, M. J.R. Hoch, J. M. Keartland, W. G. Moulton, J. Schwartz, P. V.P.S.S. Sastry

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Abstract

63Cu hyperfine shift (Knight-shift) measurements have been carried out on the trilayered superconductor Hg0.8Re0.2Ba2Ca2 Cu3O8.3 (Tc = 130 K). The temperature dependence of the in-plane Cu(1) Knight shift, for the fourfold oxygen coordinated Cu-O plane, clearly exhibits non-Fermi-liquid behavior. Our data has been placed in the context of the magnetic phase diagram of the nonlinear σ model, which highlights the various regions of magnetic scaling. In this way, evidence is obtained for the presence of a spin pseudogap in this Hg-based compound. This work also supports the suggestion of a nearly antiferromagnetic (AFM) Fermi liquid that dominates the magnetic shift and relaxation behaviors of the 63Cu spins through an isotropic transferred coupling. To test the effects of the AFM enhancements on the Cu(1) spin-lattice relaxation rate, the ratio of the dynamical and static spin susceptibilities derived from relaxation and Knight-shift data is compared to that expected for materials having a transferred coupling of the Cu spins. There is a significant increase in the departure of this ratio from the expected value of 0.53, for an unperturbed transferred coupling scenario, with a drop in temperature below 300 K, suggesting an enhancement in the AFM fluctuations in this temperature region.

Original languageEnglish (US)
Article number092502
Pages (from-to)925021-925024
Number of pages4
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume65
Issue number9
Publication statusPublished - Mar 1 2002

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All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

Cite this

Liversage, J. H., Hoch, M. J. R., Keartland, J. M., Moulton, W. G., Schwartz, J., & Sastry, P. V. P. S. S. (2002). NMR shift behavior of the planar Cu(1) site in the underdoped superconductor Hg0.8Re0.2Ba2Ca2 Cu3O8+y. Physical Review B - Condensed Matter and Materials Physics, 65(9), 925021-925024. [092502].