An overview of second sound in solid materials

Speaker: Prof. Reparaz Sebastian
Affiliation: Instituto de Ciencia de Materiales de Barcelona, Universitat Autònoma de Barcelona, Barcelona, Spain
Link to MS Teams meeting

The study of wave-like heat transport in solids (or Second Sound) received considerable research attention in the 1960s. Surprisingly, its observation remained exclusive for few materials (e.g., solid He, Bi, and NaF) and for the lower temperature range (T<15K) for almost 50 years. Recently, its successful observation at higher temperatures (T>100 K) in graphite and germanium triggered renewed interest in the field. Developing a clear path to control and exploit such thermal propagation regime has the potential to redefine the strategies to control heat propagation more efficiently. In this talk I will give an overview of the evolution of the field since its discovery in solid materials, with special focus on the latest discoveries. In particular, I will discuss the observation of two different flavors of second sound (drifting and high-frequency second sound), which are found in different experimental conditions. I will discuss the different experimental approaches used for its observation, as well as the theoretical framework used to address its origin and predict its propagation velocity and relaxation time.

Chairman: Prof. Ireneusz Weymann

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