Experimental Studies of Geometrically Frustrated Magnets

几何受挫磁体的实验研究

• 批准号: 0701582
• 负责人: Peter Schiffer
• 金额: $ 50万
• 依托单位: Pennsylvania State Univ University Park
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2007
• 资助国家: 美国
• 起止时间: 2007-07-01 至 2012-12-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0701582&HistoricalAwards=false
• 关键词: Experimental; Studies; Geometrically; Frustrated; Magnets

Technical: The project will experimentally investigate the unusual properties of geometrically frustrated magnets, materials in which the interactions between atomic spins compete with each other due to the particular geometry of the magnetic sublattice. The frustration in these materials leads to highly degenerate low temperature states in which the interaction energies cannot all be simultaneously minimized. The specific research goals of the project are to explore new geometrically frustrated magnetic materials, especially through the introduction of magnetic disorder; to examine the nature of unusual glass-like ground states in these material systems; and to explore the nature of residual 'ground state' entropy in these systems and others. The experiments will involve a range of thermodynamic experimental techniques and will be conducted in close collaboration with sample growers who can provide unique and important samples of new materials. Students involved in the research will participate in traditional and cutting edge training in a wide range of experimental techniques that will prepare them for careers in academe, industry or government.Non-technical: This is a research program into the physics of a group of materials known as rare earth geometrically frustrated magnets. The magnetic atoms in these materials are unable to point their magnetic axes (known as the magnetic moments) in a unique way to minimize their energy. The root cause of this inability to minimize the energy is the geometrical arrangement of the magnetic atoms within the materials, and this geometrical arrangement makes these materials excellent models for a wide range of other complex systems which are similarly 'frustrated'. In particular, this research program will probe the effects of disorder in such systems and the nature of the unusual states of matter which are intrinsic to such frustrated systems. Understanding these magnetic materials has implications for other systems as diverse as superconducting junction arrays and glasses, and may also provide insight into computational algorithms. The principal investigator has an extensive record of working with a diverse group of students and involving graduate students and undergraduates in every stage of the research process. Students involved in the research will participate in traditional and cutting edge training in a wide range of experimental techniques that will prepare them for careers in academe, industry or government.

技术支持：该项目将通过实验研究几何受抑磁体的异常特性，在这些材料中，由于磁子晶格的特殊几何形状，原子自旋之间的相互作用会相互竞争。这些材料中的挫折导致高度简并的低温状态，其中相互作用能不能同时最小化。 该项目的具体研究目标是探索新的几何受挫磁性材料，特别是通过引入磁无序;研究这些材料系统中不寻常的玻璃状基态的性质;并探索这些系统和其他系统中剩余“基态”熵的性质。这些实验将涉及一系列热力学实验技术，并将与能够提供独特和重要的新材料样品的样品种植者密切合作。 参与研究的学生将参加广泛的实验技术的传统和尖端培训，为他们在企业，工业或政府部门的职业生涯做好准备。非技术性：这是一个研究项目，研究一组被称为稀土几何受挫磁体的材料的物理学。 这些材料中的磁性原子无法以独特的方式指向它们的磁轴（称为磁矩）以最小化它们的能量。这种无法最小化能量的根本原因是材料中磁性原子的几何排列，这种几何排列使这些材料成为其他类似“挫败”的复杂系统的优秀模型。 特别是，该研究计划将探讨在这样的系统中的无序的影响和不寻常的物质状态的性质，这是内在的这种挫折系统。 了解这些磁性材料对超导结阵列和玻璃等其他系统具有影响，也可能提供对计算算法的见解。首席研究员有一个与不同的学生群体，并涉及研究生和本科生在研究过程的每一个阶段的工作广泛的记录。 参与研究的学生将参加各种实验技术的传统和尖端培训，这些技术将为他们在工业，工业或政府中的职业生涯做好准备。