Local Moment and Heavy Fermion Physics

9983156Coleman该基金继续支持PI在材料中的各种问题的理论工作，这些问题具有强相关电子，这些电子来自强局部电子间相互作用。 该研究计划包括重费米子材料的相关主题（即，基于铈和铀的化合物，具有非常大的比热）。 这项工作的部分动机是一系列新的实验，这些实验将重费米子材料微调到磁量子临界点，目标是解决量子临界点处是否出现局部矩，或者是否更好地将这种转变描述为自旋密度波不稳定性。许多基于铈和铀的化合物具有非常大的比热，就好像电子重一千倍。 自从八十年代中期发现这些材料以来，人们一直对这些材料的性质感兴趣。 PI一直活跃在这些材料和相关材料的理论工作中，这些材料具有由电子之间的强局部相互作用产生的强相关电子效应。 这项工作对从超导到这些材料的磁性的一系列现象具有潜在的影响。

9983156ColemanThis grant continues the support of the PI's theoretical work on a variety of problems in materials with strongly correlated electrons arising from strong local interelectron interactions. The research program consists of related topics in heavy fermion materials (i.e., compounds based on cerium and uranium with anomalously large specific heats). Part of the work is motivated by a new range of experiments that fine tune heavy fermion materials to a magnetic quantum critical point, with a goal of resolving whether local moments emerge at the quantum critical point or whether the transition is better described as a spin-density wave instability.%%%Many of the cerium and uranium based compounds have extraordinarily large specific heats, as if the electrons were a thousand times heavier. Ever since the discovery of these materials in mid-eighties, there has been a continuing interest in the properties of these materials. The PI has been active in theoretical work on these materials and related materials which have strongly correlated electronic effects arising from strong localized interactions between electrons. This work has potential impact on a range of phenomena from superconducting to magnetic properties of these materials.***