6533b852fe1ef96bd12aab14
RESEARCH PRODUCT
Nonexponential 2H spin-lattice relaxation as a signature of the glassy state
W. SchnaussHans SillescuK. HartmannF. Fujarasubject
Condensed matter physicsChemistrySpin–lattice relaxationGeneral Physics and AstronomyObservableCondensed Matter::Disordered Systems and Neural NetworksExponential functionMagnetizationNuclear magnetic resonanceSpin diffusionRelaxation (physics)Physical and Theoretical ChemistryGlass transitionSpin-½description
Abstract High-precision measurements of 2H 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 Tg the 2H 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 1H spin-lattice relaxation which is found to be strictly monoexponential throughout. The occurrence of nonexponential 2H relaxation serves as a new observable at the glass transition, being a signature of the crossover from ergodic to nonergodic behaviour.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 1990-03-01 | Chemical Physics Letters |