93Nb NMR in the imcommensurate and quasi-commensurate phases of barium sodium niobate

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Publication Type Journal Article
School or College College of Science
Department Physics
Creator Ailion, David Charles
Other Author Norcross, J.; Blinc, R.; Dolinsek, J.; Apih, T.; Slak, J.
Title 93Nb NMR in the imcommensurate and quasi-commensurate phases of barium sodium niobate
Date 1994
Description NMR spectra have been measured for the quadrupole perturbed 1/2 -1/2 transition of 9 3Nb in barium sodium niobate (BSN) between 300 and 650 K. The spectra are inhomogeneously broadened in the incommensurate (/) phase between T7 = 580 K and r c = 540 K as well as in the quasicommensurate (QC) phase below Tc. However, the observed line shapes do not exhibit the characteristics of the lines for other iq and 2q modulated incommensurate materials. The temperature dependence of the observed line shape can be explained using a model in which phase fluctuations induced by random, weak pinning of the modulation wave by defects produce Gaussian line broadening. Random pinning of the modulation wave also creates a large phason gap which makes spin-lattice relaxation via phasons inefficient. These results suggest that the presence of defects due to nonstoichiometry causes the J and QC phases of BSN to be "chaotic.
Type Text
Publisher American Physical Society
Journal Title Physical Review B
Volume 50
First Page 3625
Subject NMR; Spectra; Barium sodium niobate; Line shapes
Subject LCSH Nuclear magnetic resonance; Nuclear physics
Language eng
Bibliographic Citation Norcross, J., Ailion, D. C., Blinc, R., Dolinsek, J., Apih, T. & Slak, J. (1994). 93Nb NMR in the imcommensurate and quasi-commensurate phases of barium sodium niobate. Physical Review B, 50, 3625.
Rights Management (c) American Physical Society
Format Medium application/pdf
Format Extent 824,963 Bytes
Identifier ir-main,5030
ARK ark:/87278/s6vh668s
Setname ir_uspace
Date Created 2012-06-13
Date Modified 2021-05-06
ID 705456
Reference URL https://collections.lib.utah.edu/ark:/87278/s6vh668s
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