Acquisition of a Dilution Refrigerator

购买稀释冰箱

• 批准号: 9311739
• 负责人: Michael Naughton
• 金额: $ 4.5万
• 依托单位: SUNY at Buffalo
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1993
• 资助国家: 美国
• 起止时间: 1993-07-15 至 1994-12-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9311739&HistoricalAwards=false
• 关键词: Acquisition; Dilution; Refrigerator

In this project, a dilution refrigerator will be used to reach and maintain in large static magnetic fields temperatures less than 25 milliKelvin. It will possess at least 300 microwatts of cooling power at 0.1 Kelvin. The refrigerator will be used in research on "fine structure" phenomena in quasi-one dimensional and quasi-two dimensional conductors. In particular, several specific low temperature, high magnetic field, angular-dependent phenomena will be investigated in the organic (super) conductors, in the inorganic, charge-density-wave systems, and in novel ferromagnetically gated semiconductor heterostructures. In the organic superconductor materials, we identify four related electronic and magnetic phenomena unique to these low dimensional materials, the study of which requires the low temperature environment provided by the dilution refrigerator. The existence of one of these phenomena has been experimentally verified but not theoretically explained, two remain in contention, and another is yet to be investigated.

在这个项目中，稀释冰箱将用于在大型静态磁场中达到并保持低于25毫开尔文的温度。它将在0.1开尔文的温度下拥有至少300微瓦的冷却功率。该制冷机将用于准一维和准二维导体中“精细结构”现象的研究。特别是，在有机（超导体）、无机、电荷密度波系统和新型铁磁门控半导体异质结构中，将研究几种特定的低温、高磁场、角相关现象。在有机超导体材料中，我们发现了这些低维材料特有的四种相关的电子和磁性现象，这些现象的研究需要稀释冰箱提供的低温环境。其中一种现象的存在已被实验证实，但尚未从理论上解释，两种现象仍在争论中，另一种现象尚未得到研究。