Zero-Point Vacancies and Magnetic Surface Effects in Materials at Low Temperature

低温材料中的零点空位和磁表面效应

• 批准号: 8800359
• 负责人: Wiley Kirk
• 金额: $ 28.31万
• 依托单位: Texas A&M Research Foundation
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1988
• 资助国家: 美国
• 起止时间: 1988-03-01 至 1992-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=8800359&HistoricalAwards=false
• 关键词: Zero; Point; Vacancies; Magnetic; Surface

A study of zero-point vacancy effects in quantum solids using magnetic techniques developed under previous grant periods will be made. Measurements of zero-point vacancy effects are based on recent evidence that magnetic polarons may form around ground state vacancies in solid 3He. Quantitative results will be sought through measurements of magnetization and pressure as functions of density, applied magnetic field, temperature, impurity concentration, and sample geometry. The results will be analyzed and compared with theoretical calculations that remove some deficiencies of existing polaron models and with predictions based on improved stability criteria of polarons in the paramagnetic phase.

量子固体中零点空位效应的研究 在以前的赠款期间开发的磁技术将 被制造。 零点空位效应的测量是基于 最近的证据表明磁极子可能在地面周围形成 在固体3He中说明空位。 量化结果将 通过测量磁化强度和压力， 密度、外加磁场、温度 杂质浓度和样品几何形状。 结果将 分析并与理论计算进行比较， 现有极化子模型的一些不足和预测 基于改进的极化子稳定性准则， 顺磁相