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Observation of second sound in a rapidly varying temperature field in Ge

AuthorsBeardo, Albert; López Suárez, Miquel; Pérez, Luis Alberto; Sendra, Lluc; Alonso Carmona, M. Isabel CSIC ORCID ; Melis, Claudio; Bafaluy, Javier; Camacho, Juan; Colombo, Luciano CSIC ORCID; Rurali, Riccardo CSIC ORCID ; Alvarez, Francesc Xavier; Reparaz, J. S. CSIC ORCID
Issue Date30-Jun-2021
PublisherAmerican Association for the Advancement of Science
CitationScience advances 7(27): eabg4677 (2021)
AbstractSecond sound is known as the thermal transport regime where heat is carried by temperature waves. Its experimental observation was previously restricted to a small number of materials, usually in rather narrow temperature windows. We show that it is possible to overcome these limitations by driving the system with a rapidly varying temperature field. High-frequency second sound is demonstrated in bulk natural Ge between 7 K and room temperature by studying the phase lag of the thermal response under a harmonic high-frequency external thermal excitation and addressing the relaxation time and the propagation velocity of the heat waves. These results provide a route to investigate the potential of wave-like heat transport in almost any material, opening opportunities to control heat through its oscillatory nature.
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