US-Poland Cooperative Research on Effect of Strong Correlations and Disorder on Electron States and Phase Transitions in Vanadium Sesquioxides

美波合作研究强相关性和无序性对三氧化二钒电子态和相变的影响

• 批准号: 9308323
• 负责人: Jurgen Honig
• 金额: $ 3万
• 依托单位: Purdue Research Foundation
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1993
• 资助国家: 美国
• 起止时间: 1993-07-01 至 1996-12-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9308323&HistoricalAwards=false
• 关键词: US; Poland; Cooperative; Research; Effect

This U.S.-Poland Cooperative Research project on the Effect of Strong Correlations and Disorder on Electron States and Phase Transitions in Vanadium Sesquioxides is between Dr. J.M. Honig of Purdue University and Dr. Jozef Spalek of the University of Warsaw. The researchers plan a strongly interactive collaboration both in experiment and in theory for a thorough investigation of electron correlation effects and interaction-driven phase transitions in the (V1-xMx)2O3 system, with M = Cr, Ti, and cation vacancies and related systems. They will emphasize: (1) the proper preparation and characterization of single crystals grown by skull melting techniques; (2) measurements of heat capacity, magnetic susceptibility, and transport properties (with and without magnetic fields) in the cryogenic temperature range where lattice effects are negligible, to study their dependence on temperature, composition, and externally applied pressure; (3) the proper theoretical interpretation of the results in systems where both strong electron correlation and disorder effects determine the physical properties. The PI's involved in this project have had considerable experience in the area of materials preparation, physical measurements, and theoretical analysis, and have engaged in informal collaboration in the past. A principal result of the cooperation so far is the theoretical construction of an overall phase diagram for the (V1-xCrx)2O3 and V2(1-.)O3 systems, as well as the experimental discovery of a new boundary of V2(1-.)O3 terminating the antiferromagnetic metallic phase. They also plan as a follow-up to initiate a theoretical investigation of real space interactions involving hybrid pairing induced by Kondo-type interactions in various correlated electron systems. This research in condensed matter physics fulfills the program objectives of advancing science by enabling leading expert in the U.S. and Poland to combine complementary talents and pool research resources in areas of strong mutual interest and competence.

这个美国-波兰合作研究项目 强相关性的影响， 电子态和相位的无序 钒倍半氧化物的转变介于 J.M.博士普渡大学的霍尼格和博士。 华沙大学的Jozef Spalek 的 研究人员计划一个强互动的 实验和理论上的合作 为了彻底调查电子 关联效应与互动驱动 （V1-xMx）2O3系统的相变， M = Cr、Ti和阳离子空位及相关 系统. 他们将强调：（1）适当的 单组分的制备与表征 通过凝壳熔化技术生长的晶体;（2） 热容量的测量，磁性的 敏感性和传输特性（ 并且没有磁场） 温度范围，其中晶格效应 可以忽略不计，研究它们对 温度、成分和外部 （3）正确的理论 系统中结果的解释， 强电子关联和无序 影响决定了物理性质。 的 参与这个项目的PI 在以下领域有丰富的经验： 材料准备，物理测量， 和理论分析，并从事 过去的非正式合作。 一 目前合作的主要成果是 全面建设小康社会的理论建设 （V1-xCrx）2O3和V2（1-.）O3 系统，以及实验发现 的一个新的边界V2（1-.）O3终止 反铁磁金属相 他们还 计划作为后续行动， 真实的空间相互作用研究 涉及近藤型诱导的杂交配对 各种关联电子的相互作用 系统. 这项凝聚态物理学的研究 实现了项目目标， 科学，使美国领先的专家。 与波兰合作，将联合收割机互补的人才和 集中研究资源， 共同利益和能力。