Temperature Dependence of the Kinetic Energy in the Zr$_{40}$Be$_{60}$ Amorphous Alloy

The average kinetic energy $\langle E(T)\rangle$ of the atomic nucleus for each element of the amorphous alloy Zr$_{40}$Be$_{60}$ in the temperature range $10$–$300$ K has been measured for the first time using VESUVIO spectrometer (ISIS). The experimental values of $\langle E(T)\rangle$ have been compared to the partial ZrBe spectra refined by a recursion method based on the data obtained with thermal neutron scattering. The satisfactory agreement has been reached with the calculations using partial spectra based on thermal neutron spectra obtained with recursion method. In addition, the experimental data have been compared to the Debye model. The measurements at different temperatures ($10$, $200$, and $300$ K) will provide an opportunity to evaluate the significance of anharmonicity in the dynamics of metallic glasses.