| Issue |
Europhys. Lett.
Volume 62, Number 3, May 2003
|
|
|---|---|---|
| Page(s) | 343 - 349 | |
| Section | Electromagnetism, optics, acoustics, heat transfer, classical mechanics, and fluid dynamics | |
| DOI | https://doi.org/10.1209/epl/i2003-00402-x | |
| Published online | 01 April 2003 | |
Evidence of a superfluid phase in a Bose condensed excitonic state
Laboratorium für Festkörperphysik,
ETH Zürich - CH-8093 Zürich, Switzerland
Corresponding author: wachter@solid.phys.ethz.ch
Received:
21
January
2003
Accepted:
3
March
2003
A condensed excitonic phase has been realized in intermediate
valent 
at low temperatures and high
pressures. In this paper we report for the first time about some
thermodynamic properties such as the heat conductivity and the
thermal diffusivity which have been obtained between 300
and
1 and between ambient pressure and 17
(1.7
). Pressure and temperature are used to navigate in
the intermediate valent semiconducting phase, in the condensed
excitonic phase and in the intermediate valent metallic phase of
the complete phase diagram. In the condensed excitonic phase the
heat conductivity λ of the excitonic phase increases
exponentially below about 20 suggesting a superthermal
current for 
. In a solid this has never been
seen before. Also the thermal diffusivity a strongly increases
below 20, giving evidence for second sound.
PACS: 44.10.+i – Heat conduction / 63.20.Kr – Phonon-electron and phonon-phonon interactions / 65.40.-b – Thermal properties of crystalline solids
© EDP Sciences, 2003
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