Low-frequency spin dynamics as probed by (formula presented) and (formula presented) nmr in (formula presented) superconductors with different oxygen content

A. A. Gippius, E. V. Antipov, W. Hoffmann, K. Lüders, G. Buntkowsky

Research output: Contribution to journalArticlepeer-review

10 Citations (Scopus)

Abstract

(Formula presented) and (Formula presented) nuclear magnetic resonance was performed on a series of powder (Formula presented) samples with different oxygen content δ in order to study the influence of oxygen doping on the spin dynamics in the normal and superconducting state. The spin-lattice relaxation time (Formula presented) of (Formula presented) and (Formula presented) nuclei were measured over a wide range of temperature at different orientations of the crystallites with respect to the magnetic field. For the optimally doped sample (Formula presented)=96 K) we compared our experimental results to numerical calculations of the spin-lattice relaxation rate as a function of temperature below (Formula presented) for several types of the order parameter symmetry: isotropic s wave, anisotropic s wave without nodes, s wave with nodes, and d wave, using the different values of the gap parameter (Formula presented) within the AF fluctuation model. The comparison with our experimental relaxation data shows that for (Formula presented) nuclei in the orientation (Formula presented) plane as well as for (Formula presented) nuclei in both orientations, (Formula presented) plane and (Formula presented) axis, the experimental results are in coincidence with the (Formula presented)-wave symmetry with the gap parameter (Formula presented).

Original languageEnglish
Pages (from-to)654-660
Number of pages7
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume59
Issue number1
DOIs
Publication statusPublished - 1999
Externally publishedYes

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