期刊
PHYSICAL REVIEW LETTERS
卷 84, 期 16, 页码 3630-3633出版社
AMERICAN PHYSICAL SOC
DOI: 10.1103/PhysRevLett.84.3630
关键词
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We have extended the exploration of microscopic dynamics of supercooled liquids to small wave numbers Q corresponding to the scale of intermediate range order. by developing a new experimental approach for precise data correction for multiple scattering noise in inelastic coherent neutron scattering. Our results in supercooled Ca0.4K0.6(NO3)(1.4) reveal the first direct experimental evidence, after a decade of controversy, that the so-called picosecond process around the glass transition corresponds to a predicted first, faster stage of the structural relaxation. Ln addition, they show that this process takes the spatial form of fast heterogeneous collective flow of correlated groups of atoms.
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