We have observed a new temperature-entropy wave that propagates opposite to the direction of a steady heat flux Q when the helium column is heated from above. Counter-intuitively this new mode, which resembles second sound, propagates on the normal fluid side of the transition, but it exists only when the column of helium is heated from above. Such a new mode had been predicted to exist on the self-organized heat transport state for Q less than about 100 nW/cm2. We confirm that this mode exists in this regime, however we also observe that it propagates even when the helium is held away from the self-organized heat transport state.
|Number of pages||2|
|Journal||Physica B: Condensed Matter|
|State||Published - May 2003|
|Event||Proceedings of the 23rd international conference on low temper - Hiroshima, Japan|
Duration: Aug 20 2002 → Aug 27 2002
- Low temperature
- Self-organized criticality