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进行。选择了具有丰富相关现象的稀土-镍-碳化硼系列化合物和在高达50K的温度下表现出磁性和超导电性共存的稀土-镍-碳化硼化合物体系作为研究对象。重要的长度刻度可以通过引入点缺陷来改变。这将通过化学取代和高能电子辐射来完成，以便将与物理无序有关的影响与与化学“压力”有关的影响分开。这项研究将讨论超导和磁性共存区域中对破裂机制的作用，该区域奇异电子态的性质，以及这些磁性超导体中正常态输运的反常现象。这些结果有望对理解超导和磁性之间的相互作用具有普遍的适用性，远远超出所选择的特定材料的范围。学生将接受培训，为他们在工业、学术界或政府部门的职业生涯做好准备。与其他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，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。这项研究项目是由首席调查员和乌克兰的领先科学家共同努力的，将调查“敌对”物理状态之间的复杂相互作用，即磁性和超导电性。选择了两个化合物家族，稀土-镍-碳化物和Ruthenocuates，它们显示了与这两个状态相关的不寻常的各种现象。我们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。超导和磁性之间的相互作用是固体物理学中的一个基本问题，这项研究的结果有望使我们更好地理解这种相互作用，这种相互作用将适用于所选材料之外。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，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.