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arXiv 0710.2222cond-mat.dis-nn
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超冷玻璃在磁场中的介电常数和Heat Capacity

Dielectric Susceptibility and Heat Capacity of Ultra-Cold Glasses in Magnetic Field

Alireza Akbari, D. Bodea, A. Langari

摘要:

最近的实验表明,某些玻璃材料在低温磁场中具有意想不到的,甚至是有趣的性质。我们研究了低温下玻璃的静态介电常数和热容量与磁场的关系。我们提出了一个理论,在该理论中,我们认为耦合的隧道运动的核四极,以评估静态介电磁化率。在弱磁场的极限下,我们发现磁化率的共振部分像$B^2$一样增加,而在大磁场的极限下,它表现为1/B。以同样的方式,我们考虑耦合的隧道运动的核四极和角动量的隧道粒子,以找到热容。我们的计算结果表明,Schotky峰的角动量部分,和$B^2$依赖的核四极部分的热容,分别。我们讨论这种方法是否可以提供一个合适的解释这样的磁性。

英文摘要:

Recent experiments demonstrated unexpected, even intriguing properties of certain glassy materials in magnetic field at low temperatures. We have studied the magnetic field dependence of the static dielectric susceptibility and the heat capacity of glasses at low temperatures. We present a theory in which we consider the coupling of the tunnelling motion to nuclear quadrupoles in order to evaluate the static dielectric susceptibility. In the limit of weak magnetic field we find the resonant part of the susceptibility increasing like $B^2$ while for the large magnetic field it behaves as 1/B. In the same manner we consider the coupling of the tunnelling motion to nuclear quadrupoles and angular momentum of tunnelling particles in order to find the heat capacity. Our results show the Schotky peak for the angular momentum part, and $B^2$ dependence for nuclear quadrupoles part of heat capacity, respectively. We discuss whether or not this approach can provide a suitable explanation for such magnetic properties.

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