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

Gippius, A. A. ; Morozova, E. N. ; Antipov, E. V. ; Abakumov, A. M. ; Rozova, M. G. ; Luders, K. ; Hoffmann, W. ; Buntkowsky, G. ; Klein, O. (2000):
Magnetic flux dynamics and structural features in fluorinated HgBa2CuO4 as probed by F-19 NMR.
In: Physical Review B, 61 (21), pp. 14370-14373. [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. ; Morozova, E. N. ; Antipov, E. V. ; Abakumov, A. M. ; Rozova, M. G. ; Luders, K. ; Hoffmann, W. ; Buntkowsky, G. ; 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
Journal 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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