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Cs NMR Spin-Lattice Relaxation Study in Incommensurate Cs

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133

Cs NMR Spin-Lattice Relaxation Study in Incommensurate Cs

2

CdI

4

Koh-ichi Suzuki, Shin’ichi Ishimaru, and Ryuichi Ikeda

Department of Chemistry, University of Tsukuba, Tsukuba 305-8571, Japan

Reprint requests to Dr. S. I.; Fax: 81-298-53-6503, E-mail: ishimaru@staff.chem.tsukuba.ac.jp Z. Naturforsch. 55 a, 339–342 (2000); received August 27, 1999

Presented at the XVth International Symposium on Nuclear Quadrupole Interactions, Leipzig, Germany, July 25 - 30, 1999.

133Cs NMR spin-lattice relaxation times(T1) in crystalline Cs2CdI4 were measured at 225 - 373 K. The critical exponentofT1observed near the normal-incommensurate transition in the normal phase was determined to be 0:620:03, in good agreement with the predicted value for three-dimensional XY-model. The frequency dependentT1in the incommensurate phase could be explained by the fluctuation of amplitudon and small gap phason.

Key words:133Cs NMR;T1; Incommensurate; Phase Transition; Critical Exponent.

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