Calcium Rubidium Nitrate: Mode-Coupling $β$ Scaling without Factorization

Details Calcium Rubidium Nitrate: Mode-Coupling $β$ Scaling without Factorization Calcium Rubidium Nitrate: Mode-Coupling $β$ Scaling without Factorization

2001-01-29

arxiv.org/abs/cond-mat/0101429v1

Phys. Rev. E 64, 021303 (2001)

Physics

Condensed Matter

Soft Condensed Matter

10 pages, 11 figures, submitted to PRE

Scientific paper

10.1103/PhysRevE.64.021303

The fast dynamics of viscous calcium rubidium nitrate is investigated by depolarized light scattering, neutron scattering and dielectric loss. Fast $\beta$ relaxation evolves as in calcium potassium nitrate. The dynamic susceptibilities can be described by the asymptotic scaling law of mode-coupling theory with a shape parameter $\lambda = 0.79$; the temperature dependence of the amplitudes extrapolates to $T_c\simeq 378$ K. However, the frequencies of the minima of the three different spectroscopies never coincide, in conflict with the factorization prediction, indicating that the true asymptotic regime is unreachable.

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