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A microscopic approach to finite-size effects in sintered metallic powders

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<mark>Journal publication date</mark>1/04/1985
<mark>Journal</mark>Journal of Low Temperature Physics
Issue number1-2
Number of pages12
Pages (from-to)123-134
Publication StatusPublished
<mark>Original language</mark>English


A microscopic theory is developed of finite-size effects in sintered metallic powders. In particular a model is constructed for the low frequency vibrational modes. It is argued that the bonding between atoms on adjacent surfaces of neighboring grains is extremely weak, 10 -3 -10 -4 of its bulk value. Choosing the physical parameters accordingly, a constant density of "shaking box" states can be obtained. However, this behavior is not universal. A more complex density of states arises from slightly different choices of physical parameters and leads to a variety of temperature dependences for the sinter/liquid He Kapitza conductance at ultralow temperatures.