Home > Articles > Published articles > Observation of second sound in a rapidly varying temperature field in Ge |
Date: | 2021 |
Abstract: | Second 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. |
Grants: | Ministerio de Economía y Competitividad SEV-2015-0496 Ministerio de Ciencia e Innovación CEX2019-000917-S Agencia Estatal de Investigación MAT2017-90024-P Agencia Estatal de Investigación RTI2018-097876-B-C22 Agència de Gestió d'Ajuts Universitaris i de Recerca 2017/SGR-1506 Agència de Gestió d'Ajuts Universitaris i de Recerca 2017/SGR-00488 |
Rights: | Aquest document està subjecte a una llicència d'ús Creative Commons. Es permet la reproducció total o parcial, la distribució, la comunicació pública de l'obra i la creació d'obres derivades, sempre que no sigui amb finalitats comercials, i sempre que es reconegui l'autoria de l'obra original. |
Language: | Anglès |
Document: | Article ; recerca ; Versió publicada |
Published in: | Science advances, Vol. 7, Issue 27 (June 2021) , art. eabg4677, ISSN 2375-2548 |
6 p, 802.9 KB |