IMR: Acquisition of a Measurement System for Research and Education in Thin Film Materials

物理性质测量系统(PPMS)将被用来研究高度关联和无序材料的性质。正在研究的问题包括二维超导体-绝缘体相变(SIT)，氧化物薄膜系统中的金属-绝缘体相变，以及欠掺杂铜酸盐中超导涨落的性质。将被研究的薄膜材料展示了当代凝聚态物理中的重要范例，如量子临界性和玻璃性。PPMS将补充我们实验室用于超低温(低于1Kelvin)和扫描隧道显微镜研究的一系列专用设施。它将被用来确定样品的质量，这些样品将使用我们的专用设施进行研究。这方面的一个例子是对SIT进行静电调谐，其中将薄膜并入使用机械减薄的单晶钛酸锶(STO)衬底作为栅绝缘体的场效应晶体管配置中。低温下STO的介电常数依赖于电场，因此电荷转移是栅电压的非线性函数。PPMS将被用来校准特定的底物，然后将它们提交给稀释冰箱实验。该仪器将有助于培养传统物理博士项目的研究生，并为本科生和高中生提供体验研究的机会。物理性质测量系统(PPMS)将被用来研究高关联和无序材料的量子性质。正在研究的问题包括二维超导体-绝缘体相变，氧化物薄膜系统中的金属-绝缘体相变，以及欠掺杂铜酸盐中超导涨落的性质。这些都是当代凝聚态物理学中的重要问题。PPMS将补充我们实验室用于超低温(低于1Kelvin)和扫描隧道显微镜研究的一系列专用设施。它将提供一种手段，在1.9K到400K的温度范围内，在高达9T的磁场中对薄膜进行广泛的电学传输研究。这些对于确定样品的质量是必要的，这些样品将使用我们的专用设施进行研究。该仪器将有助于培养传统物理博士项目的研究生，并为本科生和高中生提供体验实验研究的机会。

A Physical Properties Measurement System (PPMS) will be used to investigate the properties of highly correlated and disordered materials. Problems under investigation include the superconductor-insulator transition (SIT) in two dimensions, metal-insulator transitions in oxide film systems, and the nature of superconducting fluctuations in underdoped cuprates. The thin film materials that would be investigated exhibit important paradigms in contemporary condensed matter physics such as quantum criticality and glassiness. The PPMS would complement a series of dedicated facilities in our laboratory used for ultra-low temperature (below 1 Kelvin) and scanning tunneling microscope studies. It would be used to establish the quality of the samples that would be studied using our dedicated facilities. An example of this would be in work on electrostatic tuning of the SIT in which films are incorporated in a field effect transistor configuration using a mechanically thinned single-crystal strontium titanate (STO) substrate as a gate insulator. The dielectric constant of STO at low temperatures depends upon the electric field, thus the charge transfer is a nonlinear function of gate voltage. The PPMS would be used to calibrate specific substrates before committing them to dilution refrigerator experiments. The instrument will contribute to the training of graduate students in a traditional physics Ph.D. program as well as provide opportunities for undergraduates and high school students to experience research. %%%A Physical Properties Measurement System (PPMS) will be used to investigate the quantum properties of highly correlated and disordered materials. Problems under investigation include the superconductor-insulator transition in two dimensions, metal-insulator transitions in oxide film systems, and the nature of superconducting fluctuations in underdoped cuprates. These are important problems in contemporary condensed matter physics. The PPMS would complement a series of dedicated facilities in our laboratory used for ultra-low temperature (below 1 Kelvin) and scanning tunneling microscope studies. It would provide a means of carrying out extensive, electrical transport studies of thin films in magnetic fields of up to 9T, over a temperature range from 1.9K to 400K. These are necessary to establish the quality of the samples that would be studied using our dedicated facilities. The instrument will contribute to the training of graduate students in a traditional physics Ph.D. program as well as provide opportunities for undergraduates and high school students to experience experimental research.***