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高温超导薄膜中的涨落超导电性及其维度

闻海虎 李宏成 戚振中 曹效文

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高温超导薄膜中的涨落超导电性及其维度

闻海虎, 李宏成, 戚振中, 曹效文

FLUCTUATION AND DIMENSIONALITY OF SUPERCONDUCTIVITY IN HIGH Tc THIN FILMS

WEN HAI-HU, LI HONG-CHENG, QI ZHEN-ZHONG, CAO XIAO-WEN
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  • 对RBa2Cu3O7-δ(R=Y,Gd)超导薄膜电阻温度关系的仔细测量,观察到在Tc附近有相当强的超导涨落现象,研究发现,多晶和外延的YBa2Cu3O7-δ薄膜在Tc以上均呈现出2D涨落超导电性;而当温度趋向于Tc时,有—2D向3D的转变发生,这与Lawrence-Doniach理论很好地相符,实验中还发现,一
    Strong signal of fluctuation superconductivity has been found in RBa2Cu3O7-δ(R = Y, Gd) superconducting thin films near Tc through careful investigation on resistance transitions. Detailed analyses show that, for both polycrystalline and epitaxial YBa2Cu3O7-δ thin films, it tends to be of 2D characteristic when T》Tc, but a crossover from 2D to 3D will occur when T approaches Tc, which is consistent with the prediction of Lawrence-Doniach theory. The 3D-2D crossover can also take place when a rather weak field (1.5G) is applied parallel to Cu-O planes, but it is not the case when H is perpendicular to Cu-O planes, this indicates that there is a weak coupling between Cu-O planes in YBa2Cu3O7-δ. The same study on a GdBa2Cu3O7-δ epitaxial thin films shows that the 2D feature also appeares when T》Tc, but no evidence of 3D has been found when T approaches Tc, this we think is related to the self-moment of Gd ions.
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出版历程
  • 收稿日期:  1990-05-07
  • 刊出日期:  2005-03-20

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