Fast and slow dynamics in Pr60 Ni10 Cu20 Al10 melts as seen by neutron scattering

S. M. Chathoth; A. Podlesnyak

doi:10.1063/1.2827486

Fast and slow dynamics in Pr60 Ni10 Cu20 Al10 melts as seen by neutron scattering

S. M. Chathoth, A. Podlesnyak

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Abstract

We present experimental results on the fast Β and slow α relaxational dynamics observed through incoherent quasielastic neutron scattering from Pr60 Ni10 Cu20 Al10 melts. The density correlation function, measured over a range of temperatures, shows a clear two-step relaxation process. The critical or crossover temperature, Tc, evaluated from the asymptotic scaling function of the mode-coupling theory was found to be at 620±5 K. The correlation decay is not exponential, being extended over a far wider time range. In addition, the stretched exponent Βq was found to be independent of temperature and momentum transfer (q). The self-diffusivity is an order lower compared with that observed in simple metallic liquids at their melting temperature.

Original language	English
Article number	013509
Journal	Journal of Applied Physics
Volume	103
Issue number	1
DOIs	https://doi.org/10.1063/1.2827486
State	Published - 2008
Externally published	Yes

Funding

The authors thank Professor Andreas Meyer for his support and the Paul Scherrer Institute for the beam time. S.M.C. gratefully acknowledges the financial support of the priority program 1120 phase transition in multicomponent metallic melts of Deutsche Forchungegemeinschaft (DFG) and from BMBF.

Funders	Funder number
Deutsche Forchungegemeinschaft
Bundesministerium für Bildung und Forschung

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abstract = "We present experimental results on the fast Β and slow α relaxational dynamics observed through incoherent quasielastic neutron scattering from Pr60 Ni10 Cu20 Al10 melts. The density correlation function, measured over a range of temperatures, shows a clear two-step relaxation process. The critical or crossover temperature, Tc, evaluated from the asymptotic scaling function of the mode-coupling theory was found to be at 620±5 K. The correlation decay is not exponential, being extended over a far wider time range. In addition, the stretched exponent Βq was found to be independent of temperature and momentum transfer (q). The self-diffusivity is an order lower compared with that observed in simple metallic liquids at their melting temperature.",

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AU - Chathoth, S. M.

AU - Podlesnyak, A.

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AB - We present experimental results on the fast Β and slow α relaxational dynamics observed through incoherent quasielastic neutron scattering from Pr60 Ni10 Cu20 Al10 melts. The density correlation function, measured over a range of temperatures, shows a clear two-step relaxation process. The critical or crossover temperature, Tc, evaluated from the asymptotic scaling function of the mode-coupling theory was found to be at 620±5 K. The correlation decay is not exponential, being extended over a far wider time range. In addition, the stretched exponent Βq was found to be independent of temperature and momentum transfer (q). The self-diffusivity is an order lower compared with that observed in simple metallic liquids at their melting temperature.

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Fast and slow dynamics in Pr60 Ni10 Cu20 Al10 melts as seen by neutron scattering

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