Quantum Nuclear Magnets and Superfluid 4He in Nanopores

这个项目研究了正、负自旋温度下的量子核磁铁。这些研究将主要在亚微开尔文的自旋温度下进行，使用佛罗里达大学微开尔文实验室的强大的核消磁低温恒温器，这是美国仅有的两个这样的设施之一。本研究将研究钇和氘氢化物及其合金中自旋I=1/2的原子核。将利用交流磁化率技术和超导量子干涉器件的近零场核磁共振来研究它们的磁性。这些核磁体有望成为量子偶极磁体和随机偶极量子磁体在实验室中的第一个实现。这些研究将解决磁学中涉及高量子力学自旋波动的基本问题。该项目的一个重要方面是促进博士后助理、研究生和本科生在一个独特的国家设施中参与实验的教育。这个项目研究了正、负自旋温度下的量子核磁体。这些研究将主要在亚微开尔文的自旋温度下进行，使用佛罗里达大学微开尔文实验室的强大的核消磁低温恒温器，这是美国仅有的两个这样的设施之一。本研究将研究钇和氘氢化物及其合金中自旋I=1/2的原子核。将利用交流磁化率技术和超导量子干涉器件的近零场核磁共振来研究它们的磁性。这些核磁体有望成为量子偶极磁体和随机偶极量子磁体在实验室中的第一个实现。这些研究将解决磁学中涉及高量子力学自旋波动的基本问题。该项目的一个重要方面是促进博士后助理、研究生和本科生在一个独特的国家设施中参与实验的教育。* * *

9802050 Takano This project investigates quantum nuclear magnets at positive and negative spin temperatures. The studies will be performed primarily at sub-microKelvin spin temperature using the powerful nuclear demagnetization cryostats in the MicroKelvin Laboratory of the University of Florida, one of only two such facilities in the United States. The research will investigate the spin I=1/2 nuclei in yttrium and deuterium hydrides and their alloys. Their magnetic properties will be studied using ac susceptibility techniques and near-zero-field nuclear magnetic resonance employing superconducting quantum interference devices. These nuclear magnets promise to be the first realizations on the laboratory of a quantum dipolar magnet and random dipolar quantum magnets. The studies will address fundamental issues in magnetism involving fluctuations of highly quantum mechanical spins. A significant aspect of the project is to advance the education of postdoctoral associates, graduate students, and undergraduate students involved in experiments at a unique national facility. %%% This project investigates quantum nuclear magnets at positive and negative spin temperatures. The studies will be performed primarily at sub-microKelvin spin temperature using the powerful nuclear demagnetization cryostats in the MicroKelvin Laboratory of the University of Florida, one of only two such facilities in the United States. The research will investigate the spin I=1/2 nuclei in yttrium and deuterium hydrides and their alloys. Their magnetic properties will be studied using ac susceptibility techniques and near-zero-field nuclear magnetic resonance employing superconducting quantum interference devices. These nuclear magnets promise to be the first realizations on the laboratory of a quantum dipolar magnet and random dipolar quantum magnets. The studies will address fundamental issues in magnetism involving fluctuations of highly quantum mechanical spins. A significant aspe ct of the project is to advance the education of postdoctoral associates, graduate students, and undergraduate students involved in experiments at a unique national facility. ***