133Cs NMR spin-lattice relaxation studies in incommensurate Cs2MBr4 (M=Cd, Hg)

The 133Cs NMR spin-lattice relaxation times (T1) in Cs2MBr4 (M=Cd and Hg) crystals were measured in a range of 207--369, K and 197--369, K, respectively. Critical exponents ζ at the normal-incommensurate phase transition were determined to be ζ =0.62± 0.02 and 0.50± 0.02 for M=Cd and Hg, respectivel...

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Bibliographic Details
Published in:Journal of the Physical Society of Japan 1999-06, Vol.68 (6), p.1963-1967
Main Authors: SUZUKI, K.-I, ISHIMARU, S, IKEDA, R
Format: Article
Language:English
Subjects:
Commensurate-incommensurate transitions
Condensed matter: electronic structure, electrical, magnetic, and optical properties
Condensed matter: structure, mechanical and thermal properties
Equations of state, phase equilibria, and phase transitions
Exact sciences and technology
Magnetic resonances and relaxations in condensed matter, mössbauer effect
Nuclear magnetic resonance and relaxation
Physics
Relaxation effects
Specific phase transitions
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Summary:The 133Cs NMR spin-lattice relaxation times (T1) in Cs2MBr4 (M=Cd and Hg) crystals were measured in a range of 207--369, K and 197--369, K, respectively. Critical exponents ζ at the normal-incommensurate phase transition were determined to be ζ =0.62± 0.02 and 0.50± 0.02 for M=Cd and Hg, respectively, in good agreement with the three-dimensional XY and the mean field models in the same order. Frequency dependent T1 values observed in the incommensurate phase of both compounds could be explained by fluctuations of amplitudons and phasons with a small gap.
ISSN:0031-9015
1347-4073