High frequency dynamics in liquid nickel: an IXS study

TL;DR

This study investigates high-frequency collective excitations in liquid nickel using IXS, revealing no deviation from hydrodynamic behavior and providing insights into its transport properties relevant to geophysics.

Contribution

It provides the first detailed IXS analysis of collective modes in molten nickel, clarifying its high-frequency dynamics and hydrodynamic consistency.

Findings

No deviation from generalized hydrodynamics in liquid nickel

Implications for high-frequency transport in metallic fluids

Relevance to Earth's interior processes

Abstract

Owing to their large relatively thermal conductivity, peculiar, non-hydrodynamic features are expected to characterize the acoustic-like excitations observed in liquid metals. We report here an experimental study of collective modes in molten nickel, a case of exceptional geophysical interest for its relevance in Earth interior science. Our result shed light on previously reported contrasting evidences: in the explored energy-momentum region no deviation from the generalized hydrodynamic picture describing non conductive fluids are observed. Implications for high frequency transport properties in metallic fluids are discussed.