Abstract
At temperatures below about 10mK, the temperature dependence of the thermal boundary resistance between liquid 3 He and metal sinters deviates significantly from the behaviour expected from the acoustic mismatch theory (R K ∝ T −3). This behaviour is explained in terms of the existence of a magnetic channel for the coupling between the 3 He quasiparticles and the sinter; the origin of this coupling, however, is unknown so far. In our studies of the magnetic properties of Ag sinters made of powders of submicron grain size we have detected and identified a magnetically ordering subsystem which, although it contributes only a few ppms to the total mass, dominates the magnetic properties of the sinters. We present the results of our investigation of the magnetic properties of these Ag sinters which strongly deviate from the behaviour of bulk silver, and discuss a possible mechanism how a magnetically ordered subsystem may open up the magnetic channel of the thermal boundary resistance to liquid 3 He at very low temperatures. The main conclusion of our study is that our results should allow the tuning of the thermal boundary resistance between liquid 3 He and sintered metal heat exchangers at very low temperatures.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
