Heat transport in a nuclear antiferromagnet
| Autor: | Peter Schiffer, Y. P. Feng, D. D. Osheroff |
|---|---|
| Rok vydání: | 1991 |
| Předmět: |
Thermal conductivity
Materials science Condensed matter physics Mean free path Electrical resistivity and conductivity Helium-3 Thermal resistance Heat transfer Electrical and Electronic Engineering Condensed Matter Physics Isotopes of helium Umklapp scattering Electronic Optical and Magnetic Materials |
| Zdroj: | Physica B: Condensed Matter. 169:204-208 |
| ISSN: | 0921-4526 |
| DOI: | 10.1016/0921-4526(91)90230-c |
| Popis: | We report the first measurements of heat transport due to thermal magnons in mono-domain single crystals of U2D2 3He. Between about 0.95Tc and 0.65Tc we find clear evidence for umklapp scattering with an activation energy of 5.8±0.3 mK, with a much weaker temperature dependence at lower T. Our limiting mean free paths varied from 0.3 μm to 3 μm depending upon crystal orientation. We have also measured the thermal resistance between the U2D2 solid and the bulk B superfluid phase between 0.35 mK and 0.6 mK, where we find an activated conductivity with an energy of 4.5±0.3 mK. The heat path involves both the solid-liquid boundary resistance and the resistance of superfluid in a 1 mm diameter tube. |
| Databáze: | OpenAIRE |
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