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Confirmation of the Existence of Modulation Wave Motion in Incommensurate Rb2

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Confirmation of the Existence of Modulation Wave Motion in Incommensurate Rb

2

ZnCl

4

by Hahn Echo and 2D NMR

Ligia Muntean, Ursa Mikac

a

, R. K. Subramanian

b

, and David C. Ailion

c JILA, Campus Box 440, University of Colorado, Boulder, CO 80309, USA

aJ. Stefan Institute, Ljubljana, Slovenia

bMicrocosm Inc., 4130 Guilford Road, Suite O, Columbia, MD 21046, USA

cDept. of Physics,University of Utah,115 South 1400 East, Salt Lake City, Utah 84112, USA Reprint requests to Prof. D. C. A.; Email: ailion@physics.utah.edu

Z. Naturforsch. 57 a, 353–362 (2002); received January 25, 2002

Presented at the XVIth International Symposium on Nuclear Quadrupole Interactions, Hiroshima, Japan, September 9-14, 2001.

87Rb Hahn echo nuclear magnetic resonance (NMR) and35Cl Hahn echo nuclear quadrupole resonance (NQR) measurements were performed at 293 - 302 K in the incommensurate (I) phase of Rb2ZnCl4. The existence of a Hahn echo decay that is shorter than the trueT2and one that has an exponential dependence on the cube of the echo time indicates the presence of slow motions.

The diffusion coefficient Dcan be obtained from the rate of decay of the Hahn echo. Similar values for D were obtained from the two different measurements, indicating that both the Rb and the Cl atoms are experiencing the same motional mechanism. This mechanism must be due to simultaneous motions of each and can not be due to individual motions of only one type of atom. Further confirmation of the presence of modulation wave motion was obtained from87Rb two-dimensional (2D) exchange-difference NMR measurements.

Key words: Incommensurate; Modulation Wave; Hahn Echo; 2D Exchange NMR.

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