TU Darmstadt / ULB / TUbiblio

Low-frequency spin dynamics as probed by Cu-63 and Hg-199 NMR in HgBa2CuO4+delta superconductors with different oxygen content

Gippius, A. A. and Antipov, E. V. and Hoffmann, W. and Lüders, K. and Buntkowsky, G. (1999):
Low-frequency spin dynamics as probed by Cu-63 and Hg-199 NMR in HgBa2CuO4+delta superconductors with different oxygen content.
In: Physical Review B, pp. 654-660, 59, (1), [Online-Edition: http://apps.webofknowledge.com/full_record.do?product=WOS&se...],
[Article]

Abstract

Cu-63 and Hg-199 nuclear magnetic resonance was performed on a series of powder HgBa2CuO4+delta samples with different oxygen content delta in order to study the influence of oxygen doping on the spin dynamics in the normal and superconducting state. The spin-lattice relaxation time T-1 of Hg-199 and Cu-63 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 (T-c=96 K) we compared our experimental results to numerical calculations of the spin-lattice relaxation rate as a function of temperature below T-c 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 2 Delta/k(B)T(c) within the AF fluctuation model. The comparison with our experimental relaxation data shows that for Hg-199 nuclei in the orientation B(0)parallel to(a,b) plane as well as for Cu-63 nuclei in both orientations, B(0)parallel to(a,b) plane and B(0)parallel to c axis, the experimental results are in coincidence with the d(x2-y2)-wave symmetry with the gap parameter 2 Delta/k(B)T(c)=7.02. S0163-1829(99)09801-X.

Item Type: Article
Erschienen: 1999
Creators: Gippius, A. A. and Antipov, E. V. and Hoffmann, W. and Lüders, K. and Buntkowsky, G.
Title: Low-frequency spin dynamics as probed by Cu-63 and Hg-199 NMR in HgBa2CuO4+delta superconductors with different oxygen content
Language: English
Abstract:

Cu-63 and Hg-199 nuclear magnetic resonance was performed on a series of powder HgBa2CuO4+delta samples with different oxygen content delta in order to study the influence of oxygen doping on the spin dynamics in the normal and superconducting state. The spin-lattice relaxation time T-1 of Hg-199 and Cu-63 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 (T-c=96 K) we compared our experimental results to numerical calculations of the spin-lattice relaxation rate as a function of temperature below T-c 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 2 Delta/k(B)T(c) within the AF fluctuation model. The comparison with our experimental relaxation data shows that for Hg-199 nuclei in the orientation B(0)parallel to(a,b) plane as well as for Cu-63 nuclei in both orientations, B(0)parallel to(a,b) plane and B(0)parallel to c axis, the experimental results are in coincidence with the d(x2-y2)-wave symmetry with the gap parameter 2 Delta/k(B)T(c)=7.02. S0163-1829(99)09801-X.

Journal or Publication Title: Physical Review B
Volume: 59
Number: 1
Uncontrolled Keywords: high-temperature superconductors magnetic-resonance lattice relaxation state yba2cu3o7 gap hgba2cacu2o6+delta model
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...
Additional Information:

155JR Times Cited:8 Cited References Count:32

Export:

Optionen (nur für Redakteure)

View Item View Item