Intrinsic Interactions Between Superconductivity and Magnetism in Ruthenocuprates and Quaternary and Pseudoquaternary Borocarbides

该奖项支持一个研究超导和磁性这两个“敌对”状态之间相互作用的项目。该项目将与乌克兰的顶尖科学家合作开展。稀土-镍-硼碳化物族化合物表现出丰富的相关现象，钌酸盐体系在高达50K的温度下表现出磁性和超导性共存。重要的长度尺度可以通过引入点缺陷来改变。这将通过化学替代和高能电子照射来实现，以便将与物理紊乱有关的影响与与化学“压力”有关的影响分开。本研究将探讨超导与磁性共存区域中对破断机制的作用、该区域中奇异电子态的性质以及这些磁性超导体中正常态输运的异常现象。研究结果有望对理解超导性和磁性之间的相互作用具有普遍的适用性，其有效性远远超出所选择的特定材料。学生将接受培训，为他们在工业界、学术界或政府的职业生涯做好准备。与来自另一个国家的顶尖科学家的密切接触和互动将为这些学生提供新的科学和文化视角。此外，来自德克萨斯农业和矿业大学的一名学生将有机会在乌克兰进行海外研究。该研究项目由乌克兰的首席研究员和主要科学家共同努力，将研究“敌对”物理状态（即磁性和超导性）之间复杂的相互作用。选择了稀土-镍-硼碳化物和钌酸盐这两个化合物族进行研究，它们表现出与这两种状态相关的不同寻常的现象。将研究由化学取代和高能电子辐照引入的无序对相互作用的影响。超导性和磁性之间的相互作用是固态物理学中的一个基本问题，本研究的结果有望导致对这种相互作用的更好理解，这种相互作用将适用于所选材料以外的领域。学生将有机会与国际领先的科学家合作，同时学习最先进的技术和实验技能。此外，来自德克萨斯农业和矿业大学的一名学生将有机会在乌克兰进行海外研究。

This award supports a project to investigate the interplay between two "hostile" states, superconductivity and magnetism. The project will be carried out in collaboration with leading scientists in the Ukraine. The rare-earth-nickel-borocarbide family of compounds which exhibit a wealth of related phenomena and a system of ruthenocuprates which appear to show coexistence of magnetism and superconductivity at temperatures as high as 50K have been chosen for the study. Important length scales can be changed by introduction of point defects. This will be done by both chemical substitution and irradiation with high energy electrons in order to separate the effects related to physical disorder from those related to chemical "pressure". The research will address the role of pair breaking mechanisms in the region of coexistence of superconductivity and magnetism, the nature of exotic electronic states in this region and the anomalies in normal state transport in these magnetic superconductors. The results are expected to be of general applicability to the understanding of the interplay between superconductivity and magnetism, valid well beyond the particular material chosen. Students will receive training that will prepare them for careers in industry, academia or government. The close contact and interaction with leading scientists from another country will provide new perspectives on science and culture for these students. In addition a student from Texas Agriculture and Mining University will have the opportunity to perform research overseas in the Ukraine.This research project, a joint effort by the principle investigator and leading scientists in Ukraine, will investigate the intricate interplay between "hostile" physical states, namely magnetism and superconductivity. Two families of compounds, rare-earth-nickel-borocarbides and ruthenocuprates, which show an unusual variety of phenomena related to these two states have been chosen for the studies. The effects of disorder, introduced both by chemical substitution and irradiation with high energy electrons, on the interplay will be studied. The interplay between superconductivity and magnetism is a fundamental problem in solid state physics, and the results of this investigation are expected to lead to a much better understanding of this interplay that will be applicable beyond the chosen materials. Students will have the opportunity to collaborate with leading international scientists while learning state-of-the art technology and experimental skills. In addition a student from Texas Agriculture and Mining University will have the opportunity to perform research overseas in the Ukraine.