scholarly journals Vortex density waves and high-frequency second sound in superfluid turbulence hydrodynamics

2007 ◽  
Vol 368 (1-2) ◽  
pp. 7-12 ◽  
Author(s):  
D. Jou ◽  
M.S. Mongiovi` ◽  
M. Sciacca
Keyword(s):  
High Frequency ◽  
Second Sound ◽  
Density Waves ◽  
Superfluid Turbulence ◽  
Vortex Density

scholarly journals Vortex density waves and negative absolute resistance in patterned superconductors

2011 ◽  
Vol 83 (18) ◽  
Author(s):  
Rogério M. da Silva ◽  
Clécio C. de Souza Silva
Keyword(s):  
Density Waves ◽  
Vortex Density

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

2021 ◽  
Vol 7 (27) ◽  
pp. eabg4677
Author(s):  
Albert Beardo ◽  
Miquel López-Suárez ◽  
Luis Alberto Pérez ◽  
Lluc Sendra ◽  
Maria Isabel Alonso ◽  
...  
Keyword(s):  
Temperature Field ◽  
Relaxation Time ◽  
High Frequency ◽  
Room Temperature ◽  
Heat Waves ◽  
Thermal Response ◽  
Thermal Excitation ◽  
Phase Lag ◽  
Second Sound ◽  
Temperature Waves

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.

scholarly journals Probing Vortex Density Fluctuations in Superfluid Turbulence

2008 ◽  
pp. 532-534
Author(s):  
P.-E. Roche ◽  
B. Chabaud ◽  
O. Français ◽  
L. Rousseau ◽  
H. Willaime
Keyword(s):  
Density Fluctuations ◽  
Superfluid Turbulence ◽  
Vortex Density

scholarly journals Phase velocity limit of high-frequency photon density waves

1995 ◽  
Author(s):  
Richard C. Haskell ◽  
Lars O. Svaasand ◽  
Sten Madsen ◽  
Fabio E. Rojas ◽  
T.-C. Feng ◽  
...  
Keyword(s):  
Phase Velocity ◽  
High Frequency ◽  
Photon Density ◽  
Density Waves ◽  
Photon Density Waves
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