The Properties of “Quasi-Reentrant” Behavior in Granular System

IF 1.6 4区物理与天体物理 Q3 PHYSICS, APPLIED

Journal of Superconductivity and Novel Magnetism Pub Date : 2024-12-16 DOI:10.1007/s10948-024-06852-0

Xiu-Zhi Duan, Guang-Xin Wang, Li-Chun Hu, Zhang Pan

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Abstract

We have investigated the superconductor-insulator transition (SIT) induced by a disorder of a granular system. The effective energy gap model based on localized Cooper pairs and hopping quasiparticles has been used. The “quasi-reentrant” behavior appears when the metal volume fraction is slightly smaller than the percolation threshold. In particular, we have found the double “quasi-reentrant” behavior with the increased superconducting transition width. This result indicates that the double “quasi-reentrant” behavior should have been observed in a granular system with a large transition width. Besides, the “quasi-reentrant” behavior has been flattened when applying the magnetic field. In order to clarify the method is suitable for a granular system, the theoretical result has been compared with the experimental value of Pb\(_x\)(SiO\(_2\))\(_{1-x}\) granular film. It has almost no difference near the minimum value and the differences onset at lower temperatures due to the negative electroresistance effect. The “quasi-reentrant” behavior becomes unobvious due to the Copper pairs destroyed by the magnetic field.

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我们研究了粒状系统无序诱导的超导体-绝缘体转变（SIT）。我们使用了基于局域库珀对和跳跃准粒子的有效能隙模型。当金属体积分数略小于渗流阈值时，就会出现 "准反渗 "行为。特别是，我们发现随着超导转变宽度的增加，会出现双重 "准回归 "行为。这一结果表明，在过渡宽度较大的粒状系统中，本应观察到双重 "准反常 "行为。此外，在施加磁场时，"准反越态 "行为变得平缓。为了明确该方法是否适用于粒状体系，我们将理论结果与 Pb\(_x\)(SiO\(_2\))\(_{1-x}\) 粒状薄膜的实验值进行了比较。在最小值附近几乎没有差异，而由于负电阻效应，差异在较低温度下开始出现。由于磁场破坏了铜对，"准缓变 "行为变得不明显。

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来源期刊

Journal of Superconductivity and Novel Magnetism 物理-物理：凝聚态物理

CiteScore

3.70

自引率

11.10%

发文量

342

审稿时长

3.5 months

期刊介绍： The Journal of Superconductivity and Novel Magnetism serves as the international forum for the most current research and ideas in these fields. This highly acclaimed journal publishes peer-reviewed original papers, conference proceedings and invited review articles that examine all aspects of the science and technology of superconductivity, including new materials, new mechanisms, basic and technological properties, new phenomena, and small- and large-scale applications. Novel magnetism, which is expanding rapidly, is also featured in the journal. The journal focuses on such areas as spintronics, magnetic semiconductors, properties of magnetic multilayers, magnetoresistive materials and structures, magnetic oxides, etc. Novel superconducting and magnetic materials are complex compounds, and the journal publishes articles related to all aspects their study, such as sample preparation, spectroscopy and transport properties as well as various applications.