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Magnetic flux dynamics and structural features in fluorinated HgBa2CuO4 as probed by F-19 NMR

Gippius, A. A. and Morozova, E. N. and Antipov, E. V. and Abakumov, A. M. and Rozova, M. G. and Luders, K. and Hoffmann, W. and Buntkowsky, G. and Klein, O. (2000):
Magnetic flux dynamics and structural features in fluorinated HgBa2CuO4 as probed by F-19 NMR.
In: Physical Review B, pp. 14370-14373, 61, (21), [Online-Edition: http://apps.webofknowledge.com/full_record.do?product=WOS&se...],
[Article]

Abstract

F-19 NMR spectra and spin-lattice relaxation rates have been measured on two powder HgBa2CuO4Fx samples. The results combined with our neutron powder-diffraction data A. M. Abakumov rt al., Phys. Rev. Lett. 80, 385 (1998) confirm that fluorine atoms can be successfully incorporated in the lattice of superconducting Hg-1201 phase in the nonstoichiometric O3 site. Partial occupation of another oxygen position by fluorine atoms reveals to be possible with the increase of F content. The temperature dependence of the F-19 NMR linewidth reveals the crossover at 35 K in the magnetic-flux line structure between the low-temperature latticelike regime and high-temperature "melted" regime. For the 1/T-1 temperature dependence a maximum has been found at 65 K indicating the strong influence of magnetic-flux line motion on the F-19 spin-lattice relaxation rate.

Item Type: Article
Erschienen: 2000
Creators: Gippius, A. A. and Morozova, E. N. and Antipov, E. V. and Abakumov, A. M. and Rozova, M. G. and Luders, K. and Hoffmann, W. and Buntkowsky, G. and Klein, O.
Title: Magnetic flux dynamics and structural features in fluorinated HgBa2CuO4 as probed by F-19 NMR
Language: English
Abstract:

F-19 NMR spectra and spin-lattice relaxation rates have been measured on two powder HgBa2CuO4Fx samples. The results combined with our neutron powder-diffraction data A. M. Abakumov rt al., Phys. Rev. Lett. 80, 385 (1998) confirm that fluorine atoms can be successfully incorporated in the lattice of superconducting Hg-1201 phase in the nonstoichiometric O3 site. Partial occupation of another oxygen position by fluorine atoms reveals to be possible with the increase of F content. The temperature dependence of the F-19 NMR linewidth reveals the crossover at 35 K in the magnetic-flux line structure between the low-temperature latticelike regime and high-temperature "melted" regime. For the 1/T-1 temperature dependence a maximum has been found at 65 K indicating the strong influence of magnetic-flux line motion on the F-19 spin-lattice relaxation rate.

Journal or Publication Title: Physical Review B
Volume: 61
Number: 21
Uncontrolled Keywords: different oxygen-content spin-lattice relaxation y-89 nmr irreversibility line superconductors yba2cu4o8 vortices
Divisions: 07 Department of Chemistry
07 Department of Chemistry > Physical Chemistry
Date Deposited: 27 Oct 2014 20:41
Official URL: http://apps.webofknowledge.com/full_record.do?product=WOS&se...
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321DB Times Cited:7 Cited References Count:25

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