Dynamical Properties of Disordered Solids and Quantum Solidsat Low Temperatures

无序固体和量子固体在低温下的动力学性质

• 批准号: 8913999
• 负责人: Neil Sullivan
• 金额: $ 28.5万
• 依托单位: University of Florida
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1990
• 资助国家: 美国
• 起止时间: 1990-01-15 至 1993-12-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=8913999&HistoricalAwards=false
• 关键词: Dynamical; Properties; Disordered; Solids; Quantum

Low-energy collective excitations in quenched disordered solids, the motion of vacancies in quantum crystals, and transport in highly polarized Fermi liquids will be studied. NMR and thermal transport measurements will be used to study low temperature relaxation in orientational glass states of N2/Alkali metal solid mixtures and NaCN/KCN mixed crystals. The existence of universality classes for the growth kinetics of correlated clusters in quenched disordered systems will be tested. Quantum tunneling of vacancies in isotopic helium solid solutions close to the melting curve will be studied with pulsed NMR. The effects of the onset of degeneracy on spin diffusion and transport properties of small, highly polarized helium-three droplets phase separated from solid solutions will be studied.

淬火无序固体中的低能集体激发， 量子晶体中空位的运动， 高度极化的费米液体将被研究。 NMR和热分析 运输测量将用于研究低温 N2/碱金属固体取向玻璃态弛豫 混合物和NaCN/KCN混合晶体。 的存在 相关生长动力学的普适类 将测试猝灭无序系统中的簇。 量子 同位素氦固溶体中空位的隧穿 将用脉冲NMR研究熔融曲线。 的 简并开始对自旋扩散的影响， 小的，高度极化的氦-3的输运性质 将研究从固溶体分离的液滴相。