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PrCaBaMnO锰酸盐的磁学和电学性质研究。

Study of magnetic and electrical properties of PrCaBaMnO manganite.

作者信息

Mleiki Ali, Hanen R, Rahmouni H, Guermazi N, Khirouni K, Hlil E K, Cheikhrouhou A

机构信息

Unité de Recherche Matériaux Avancés et Nanotechnologies (URMAN), Institut Supérieur des Sciences Appliquées et de Technologie de Kasserine, Kairouan University BP 471 Kasserine 1200 Tunisia

LT2S, Digital Research Center of Sfax Sfax Technoparc 3021 Sfax Tunisia.

出版信息

RSC Adv. 2018 Sep 12;8(55):31755-31763. doi: 10.1039/c8ra05747h. eCollection 2018 Sep 5.

DOI:10.1039/c8ra05747h
PMID:35548220
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC9085919/
Abstract

The magnetic properties and magnetocaloric effect (MCE) in PrCaBaMnO have been investigated supplemented by electrical data. X-ray diffraction shows that the sample crystallizes in the distorted orthorhombic system with the space group. PrCaBaMnO undergoes paramagnetic-ferromagnetic (PM-FM) phase transition at ∼ 85 K. For a magnetic field change of 5 T, the maximum value of the magnetic entropy change (-Δ ) is estimated to be 4.4 J kg K around with a large relative cooling power (RCP) value of 263.5 J kg. While the modified Arrott plots suggested that the magnetic transition belongs to the second order phase transitions, the universal curves of the rescaled magnetic entropy (Δ ) proved the opposite. The electrical properties of PrCaBaMnO have been investigated using impedance spectroscopy techniques. The dc-resistivity ( ) study shows the presence of semiconductor behavior. Ac-conductivity ( ) analysis shows that the conductivity is governed by a hopping process. From the analysis of the alternating regime, the exponent variation obtained is in good agreement with Mott theory. The impedance spectrum analysis reveals the presence of a relaxation phenomenon. Based on these analyzes, the sample can be modeled by an electrical equivalent circuit.

摘要

通过电学数据补充研究了PrCaBaMnO中的磁性和磁热效应（MCE）。X射线衍射表明，样品结晶为具有特定空间群的畸变正交晶系。PrCaBaMnO在约85K时经历顺磁-铁磁（PM-FM）相变。对于5T的磁场变化，磁熵变（-Δ ）的最大值估计在 附近为4.4J kg K，相对制冷功率（RCP）值较大，为263.5J kg。虽然修正的阿罗特图表明磁转变属于二级相变，但重标磁熵（Δ ）的通用曲线却证明了相反的情况。利用阻抗谱技术研究了PrCaBaMnO的电学性质。直流电阻率（ ）研究表明存在半导体行为。交流电导率（ ）分析表明，电导率受跳跃过程控制。从交变 regime 的分析来看，得到的指数 变化与莫特理论吻合良好。阻抗谱分析揭示了弛豫现象的存在。基于这些分析，该样品可以用电学等效电路来建模。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/d4cd/9085919/206f692ff45a/c8ra05747h-f9.jpg
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https://cdn.ncbi.nlm.nih.gov/pmc/blobs/d4cd/9085919/c7585118d29b/c8ra05747h-f5.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/d4cd/9085919/b6ea4881b40a/c8ra05747h-f6.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/d4cd/9085919/7f07c8bf74d0/c8ra05747h-f7.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/d4cd/9085919/b575eec977c8/c8ra05747h-f8.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/d4cd/9085919/206f692ff45a/c8ra05747h-f9.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/d4cd/9085919/ecc4d3bc24f1/c8ra05747h-f1.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/d4cd/9085919/8dc6b289314d/c8ra05747h-f2.jpg
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https://cdn.ncbi.nlm.nih.gov/pmc/blobs/d4cd/9085919/697ae1d9121d/c8ra05747h-f4.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/d4cd/9085919/c7585118d29b/c8ra05747h-f5.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/d4cd/9085919/b6ea4881b40a/c8ra05747h-f6.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/d4cd/9085919/7f07c8bf74d0/c8ra05747h-f7.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/d4cd/9085919/b575eec977c8/c8ra05747h-f8.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/d4cd/9085919/206f692ff45a/c8ra05747h-f9.jpg

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