薄い超伝導Sn膜の性質
1968 年 37 巻 9 号 p. 821-826
詳細
1968 年 37 巻 9 号 p. 821-826
Tin films of thickness ranging from 100Â to 5000Â deposited onto Liquid-nitrogen-cooled substrates of soda lime glass were found to be continuous even after warming to room temperature if the warming was done in the presence of dry oxygen at a pressure of 1 Torr to avoid agglomeration. The electron diffraction experiments showed that tin films less than 1000Â thick had a preferedorientation with C axis parallel to the substrate. The variation of the superconducting critical temperature Tof of tin films with filmthickness d was obtained by the relation
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where Tcb is the critical temperature of bulk tin. The sharp increaseof the critical temperature with decreasing film thickness is interpreted to bedue to theappearance of the prefered orientation in this films.
