Hg-199 and Cu-65,Cu-65 Nmr-Studies of Mercury Based High-T-C Supercouductors

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Hg-199 and Cu-65,Cu-65 Nmr-Studies of Mercury Based High-T-C Supercouductors

W. Hoffmann,Hergen Breitzke,Craig T. Simmons,Klaus Lüders,Gerd Buntkowsky,Hans‐Heinrich Limbach+6 more-1995-01-01-TUbilio (Technical University of Darmstadt)

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TL;DRAbstract

Hg-oxide ceramic high temperature superconductors were studied by Hg-199 and (CU)-C-63,65 NMR spectroscopy. Room temperature spectra, spin-spin and spin-lattice relaxation times of samples with different superconducting transition temperatures are presented. A spin-lattice relaxation time of T-1 = 35 msec and a spin-spin relaxation time of T-2 = 1.6 msec were found for the Hg-199 NMR. All samples exhibit similar characteristic powder spectra caused by an axially symmetric Hg-199 spin interaction. The isotropic value and the anisotropy of the tenser relative to solid HgCl2 as a standard substance is estimated. Furthermore, results of (CU)-C-63,65 NMR measurements at a temperature of 4.2 K which exhibit a typical powder line shape (for I = 3/2) are presented.

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Hg-oxide ceramic high temperature superconductors were studied by Hg-199 and (CU)-C-63,65 NMR spectroscopy. Room temperature spectra, spin-spin and spin-lattice relaxation times of samples with different superconducting transition temperatures are presented. A spin-lattice relaxation time of T-1 = 35 msec and a spin-spin relaxation time of T-2 = 1.6 msec were found for the Hg-199 NMR. All samples exhibit similar characteristic powder spectra caused by an axially symmetric Hg-199 spin interaction. The isotropic value and the anisotropy of the tenser relative to solid HgCl2 as a standard substance is estimated. Furthermore, results of (CU)-C-63,65 NMR measurements at a temperature of 4.2 K which exhibit a typical powder line shape (for I = 3/2) are presented.

Keywords

AnisotropyChemistrySpin–lattice relaxationNMR spectra databaseSpectral lineAnalytical Chemistry (journal)Nuclear magnetic resonance spectroscopyRelaxation (psychology)

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