Ergodic to nonergodic transition in liquids with a local order: the case of m-toluidine.
The dynamic structure factor of m-toluidine has been measured by inelastic x-ray scattering in the mesoscopic Q range between 1 and 10 nm(-1), where a prepeak is revealed in the static structure factor resulting from the existence of hydrogen bonded, nanometer size clusters. Evidence is given of (i) a square-root cusp in the nonergodicity factor and of (ii) critical nonergodicity parameters which oscillate in phase with the static structure factor. These results demonstrate that local order in a liquid can coexist with the signatures of the ergodic to nonergodic transition predicted by the mode coupling theory for simple, dense liquids.
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INFM CRS-SOFT, c/o Universitá di Roma La Sapienza, P. A. Moro 2, I-00185 Roma, Italy.
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Monaco
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Verbeni
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Fioretto
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