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Nonexponential 2H spin-lattice relaxation as a signature of the glassy state

✍ Scribed by W. Schnauss; F. Fujara; K. Hartmann; H. Sillescu

Publisher: Elsevier Science
Year: 1990
Tongue: English
Weight: 303 KB
Volume: 166
Category: Article
ISSN: 0009-2614
DOI: 10.1016/0009-2614(90)85047-g

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✦ Synopsis

High-precision measurements of "H spin-lattice relaxation on several molecular glass-forming liquids have been performed. As a general feature the following can be stated: At temperatures more than ten to twenty degrees above the calorimetric glass transition temperature r, the *H spin-lattice relaxation is exponential; below that temperature regime the relaxation is nonexponential. This crossover from exponential to nonexponential magnetization recovery implies that no common spin temperature caused by spin diffusion exists in a 2H glass. This contrasts 'H spin-lattice relaxation which is found to be strictly monoexponential throughout. The occurrence of nonexponential *H relaxation serves as a new observable at the glass transition, being a signature of the crossover from ergodic to nonergodic behaviour.

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