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arXiv 2109.00325cond-mat.dis-nncond-mat.mtrl-sci
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非磁性复合介质中磁场驱动介电弛豫的低温研究

Magnetic field driven dielectric relaxation in non-magnetic composite medium: a low temperature study

Krishna Prasad Maity, Ananya Patra, Narendra Tanty, V Prasad

摘要:

研究了不同功能化程度的聚苯胺(PANI)/多壁碳纳米管(MWCNT)复合材料在低温(4.2K以下)和磁场(3 T)作用下的介电常数随频率的变化关系。通过在两个方向上施加低于10 $^3$ Hz的磁场,在所有MWCNT/PANI复合材料中观察到弛豫现象。然而,PANI在任一方向上施加磁场均未显示出任何弛豫峰。弛豫峰频率不依赖于磁场的强度,但随温度和复合材料中多壁碳纳米管的功能化程度而变化。这种弛豫现象的发生是由于两种高度失配的导电材料在低温下介质的不均匀性。我们试图用Parish和Littlewood的磁电容理论解释我们的结果。

英文摘要:

The frequency dependence of dielectric constant for composites of polyaniline (PANI) and multi-walled carbon nanotube (MWCNT) with different degree of functionalization is studied at low temperature (down to 4.2 K) and magnetic field (up to 3 Tesla) applied both in parallel and perpendicular direction of ac electric field. A relaxation phenomenon is observed in all the MWCNT/PANI composites by applying magnetic field in both the directions, below 10$^3$ Hz. However, PANI does not show any relaxation peak with applied magnetic field in either direction. The relaxation peak frequency does not depend on the strength of magnetic field but it varies with temperature and degree of functionalization of MWCNT in composites. This relaxation phenomenon occurs due to the inhomogeneity of the medium of two highly mismatched conductive materials at low temperatures. We have tried to explain our results in the light of Parish and Littlewood theory about magnetocapacitance in nonmagnetic composite.

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