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標題Title: Superconductivity of gallium in various confined geometries
作者Authors: 林開政,E. V. Charnaya..等
上傳單位Department: 機械工程系
上傳時間Date: 2010-6-30
上傳者Author: 林開政
審核單位Department: 機械工程系
審核老師Teacher: 林開政
檔案類型Categories: 論文Thesis
關鍵詞Keyword: superconductivity, gallium
摘要Abstract: The superconductivity of gallium in porous glasses with various pore sizes and in opals is studied using a
superconducting quantum interference device magnetometer. The single and double superconducting phase
transitions are observed for different samples. Magnetization hysteresis loops are also measured and found to
be dependent on pore sizes and geometry. The changes in magnetization below about 6.4 K are treated within
the framework of models for granular superconductors, while the alterations in magnetization near 7.1 K are
treated as a result of the superconducting phase transition in a coexistent structural modification of confined
gallium. X-ray diffraction measurements are performed to confirm the presence of such an additional gallium
modification. The results obtained allow us to suggest that studies of magnetization at low temperatures can be
used to get information about the geometry of the pore network and distribution of Josephson links in porous
composite materials.

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