31P NMR spin-lattice relaxation: structural glass dynamics in Rb1-x(ND4)xD2PO4

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Publication Type Journal Article
School or College College of Science
Department Physics
Creator Ailion, David Charles
Other Author Chen, Songhua; Laicher, Gernot
Title 31P NMR spin-lattice relaxation: structural glass dynamics in Rb1-x(ND4)xD2PO4
Date 1993
Description We performed 3 1P NMR measurements of the temperature-dependent spin-lattice relaxation time in several mixed single crystals of Rbi_x(ND4 ) xD2P04 [DRADP] having different ammonium concentration x (x =0.22, 0.44, 0.78) as well as in three pure single crystals (ND4)D2P04 [DADP], (NH4)H2P04 [ADP], and RbH2P04 [RDP]. The 3 1P NMR spin-lattice relaxation-time measurements in mixed crystals show that the phosphorus nuclei are strongly influenced by the gradual slowing down of the motions of protons in the nearby O-D • • • O acid bonds in the structural spin-glass states. In addition to a common Tl minimum observed in all ammonium-containing systems, a second Tl minimum is observed in the temperature region of the glass transition in mixed spin-glass systems but not in pure ADP, DADP, or RDP. We attribute this lower temperature Tx minimum to the extreme slowing down of the O-D • • • O intrabond motion, which is unique to the glass system. In addition, the correlation times and activation energies for the Tx minima in all samples were determined. A comparison between the pure and mixed systems reveals that the mixed system 7^ minimum must be fit to a distribution of correlation functions but that each pure system requires only a single correlation function. Furthermore, measurements on systems having x =0.78 and 0.22 show that 3 1P NMR can be used to determine the threshold concentrations that characterize the glass phase.
Type Text
Publisher American Physical Society
Journal Title Physical Review B
Volume 47
First Page 3047
Subject NMR; Spin-lattice; Relaxation; Crystals; Glass; Spin-glass
Subject LCSH Nuclear magnetic resonance; Nuclear physics
Language eng
Bibliographic Citation Chen, S., Ailion, D. C. & Laicher, G. (1993). 31P NMR spin-lattice relaxation: structural glass dynamics in Rb1-x(ND4)xD2PO4. Physical Review B, 47, 3047.
Rights Management (c) American Physical Society
Format Medium application/pdf
Format Extent 1,078,826 Bytes
Identifier ir-main,5028
ARK ark:/87278/s6gt65cd
Setname ir_uspace
Date Created 2012-06-13
Date Modified 2021-05-06
ID 703051
Reference URL https://collections.lib.utah.edu/ark:/87278/s6gt65cd
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