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Growth of magnesium diboride films on 2 inch diameter copper discs by hybrid physical-chemical vapor deposition

机译:通过混合物理化学气相沉积2英寸直径铜盘上的二硼胶膜的生长

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摘要

Magnesium diboride (MgB2) coating is a potential candidate to replace bulk niobium (Nb) for superconducting radio frequency cavities due to the appealing superconducting properties of MgB2. MgB2 coating on copper may allow cavity operation near 20-25 K as a result of the high transition temperature (T-c) of MgB2 and excellent thermal conductivity of Cu. We have grown MgB2 films on 2 inch diameter Cu discs by hybrid physical-chemical vapor deposition for radio frequency characterization. Structural and elemental analyses showed a uniform MgB2 coating on top of a Mg-Cu alloy layer with occasional intrusion of Mg-Cu alloy regions. High T-c values of around 37 K and high critical current density (J(c)) on the order of 10(7) A cm(-2) at zero field were observed. Radio frequency measurements at 11.4 GHz confirmed a high T-c and showed a quality factor (Q(0)) much higher than for Cu and close to that of Nb.
机译:由于MGB2的吸引力,替代对超导射频空腔的潜在铌(Nb)替代块状铌(Nb)的潜在候选者。 铜上的MgB2涂层可以允许腔操作靠近20-25k,其MGB2的高转变温度(T-C)和Cu的优异导热率。 通过混合物理化学气相沉积进行射频表征,我们在2英寸直径Cu光盘上养了MGB2薄膜。 结构和元素分析在Mg-Cu合金层顶部显示均匀的MgB2涂层,偶尔侵入Mg-Cu合金区。 观察到零场10(7)cm(-2)的大约37k和高临界电流密度(j(c))的高T-C值(j(c))。 11.4GHz的射频测量确认了高T-C,并显示出高于Cu的质量因数(Q(0))并接近Nb的质量因子(Q(0))。

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