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arXiv 1703.04494cond-mat.dis-nncond-mat.stat-mech
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玻璃形成液体的热导率

Thermal Conductivity of Glass-Forming Liquids

Pranab Jyoti Bhuyan, Rituparno Mandal, Pinaki Chaudhuri, Abhishek Dhar, Chandan Dasgupta

摘要:

利用大量的数值模拟研究了液态和玻璃态下模型玻璃形成系统的热导率。我们发现,在玻璃化转变温度附近,结构弛豫时间变得很长,测得的热导率随着年龄的增加而降低。其次,在低温下获得的无序固体的热导率取决于其制备的冷却速率,较低的冷却速率导致较低的热导率。我们的分析将这种热导率的降低与对潜在势能景观的低能固有结构的更多探索联系起来。此外,我们表明,较低能量的固有结构的电导率的降低是与固有结构的扩展较少的高频谐波模式。

英文摘要:

Thermal conductivity of a model glass-forming system in the liquid and glass states is studied using extensive numerical simulations. We show that near the glass transition temperture, where the structural relaxation time becomes very long, the measured thermal conductivity decreases with increasing age. Secondly the thermal conductivity of the disordered solid obtained at low temperatures depends on the cooling rate with which it was prepared, with lower cooling rates leading to lower thermal conductivity. Our analysis links this decrease of the thermal conductivity with increased exploration of lower-energy inherent structures of the underlying potential energy landscape. Further we show that the lowering of conductivity for lower-energy inherent structures is related to the high frequency harmonic modes associated with the inherent structure being less extended.

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