The dynamics of magnetic field penetration into thin-walled superconducting niobium cylinders is experimentally investigated. It is shown that magnetic field penetrates through the wall of a cylinder in a series of giant jumps with amplitude 10 - 20 Oe and duration of a few $μ$s. The jumps take place when the total current in the wall, not the current density, exceeds some critical value. In addition there are small jumps and/or smooth penetration, and their contribution can reach 20% of the total penetrating flux. It is demonstrated that the magnetic field inside the cylinder exhibits several oscillations. The number of giant jumps reduces with temperature.
Giant demagnetization effects induced by superconducting films
研究表明，由于超导体对杂散磁场的Meissner屏蔽作用，面内磁化的铁磁（F）板夹在两层超导（S）膜之间时，会产生强烈的退磁效应.在极端情况下，S膜从正常状态到超导状态的转变可以将退磁因子从0切换到1，这与S/F双层形成鲜明对比，在S/F双层中，这种转变仅轻微地影响F膜内部的磁场。巨大的退磁效应被证明是对超导膜厚度的减少定性鲁棒性，并可能提供一个线索，对最近观察到的S/F/S结构的巨大的铁磁共振频移的解释[I. A. Golovchanskiy，N. N.阿布拉莫夫斯托利亚罗夫Chichkov，M.西拉耶夫岛V. Shchetinin，A. A. Golubov，V. V. Ryazanov，A. V. Ustinov和M. Yu. Kuprianov，Phys.Rev.Appl.14，024086（2020）]。
Suppression of phase separation and giant enhancement of superconducting transition temperature in FeSe$_{1-x}$Te$_{x}$ thin films
我们证明了成功的制造与$0 \le x \le 1$的FeSe $_{1-x}$ Te $_{x}$薄膜的CaF $_2$衬底上，包括区域的$0.1 \le x \le 0.4$，这是众所周知的“相分离区”，通过脉冲激光沉积，这是一种非平衡的方法。在由此产生的薄膜中，我们观察到一个巨大的增强的超导转变温度，$T_\mathrm{c}$，在该区域的$0.1 \le x \le 0.4$：最大值达到23 K，这是大约1.5倍大的散装样品的FeSe $_{1-x}$ Te $_{x}$报告的值。我们提出了一个完整的相图FeSe $_{1-x}$ Te $_{x}$薄膜。令人惊讶的是，在$0.1<x<0.2$处观察到$T_\mathrm{c}$的突然抑制，而对于$0.2 \le x < 1$，$T_\mathrm{c}$随着$x$的降低而增加。也就是说，在$x=0-0.1$和$x \ge 0.2$中实现的超导性之间存在明显的差异。为了获得具有高$T_\mathrm{c}$的FeSe $_{1-x}$ Te $_{x}$薄膜，发现Te含量$x$和面内晶格应变的控制是关键因素。
Giant Resonances in Superconducting Films Induced by Nonsuperconducting Layers
Universidade Federal Fluminense（弗鲁米嫩塞联邦大学）；Instituto de Física, Universidade Federal do Rio de Janeiro（里约热内卢联邦大学物理研究所）；Instituto Militar de Engenharia（军事工程学院）；Departamento de Física, Universidade Federal Rural do Rio de Janeiro（里约热内卢联邦农村大学物理系）；Centre for Quantum Metamaterials, Higher School of Economics University（高等经济学院量子超材料中心）
Giant Room-Temperature Third-Order Electrical Transport in a Thin-Film Altermagnet Candidate
School of Materials Science and Engineering, Beihang University（北京航空航天大学材料科学与工程学院）；School of Physics, Beihang University（北京航空航天大学物理学院）；State Key Laboratory of Tropic Ocean Engineering Materials and Materials Evaluation, Beihang University（北京航空航天大学热带海洋工程材料与材料评价国家重点实验室）；National Synchrotron Radiation Laboratory, University of Science and Technology of China（中国科学技术大学国家同步辐射实验室）；Anhui Key Laboratory of Low-Energy Quantum Materials and Devices, High Magnetic Field Laboratory, Hefei Institutes of Physical Science, Chinese Academy of Sciences（中国科学院合肥物质科学研究院高磁场中心安徽低能量子材料与器件重点实验室）
