Evolution of current-voltage characteristics in Bi2Sr2CaCu2O8 intrinsic tunnel Josephson junctions

被引：19

作者：

Suzuki, M

Hidaka, Y

Tanabe, K

Karimoto, S

Namekawa, K

机构：

来源：

JAPANESE JOURNAL OF APPLIED PHYSICS PART 2-LETTERS & EXPRESS LETTERS | 1996年 / 35卷 / 6B期

关键词：

Bi2Sr2CaCu2O8; intrinsic tunnel Josephson junction; energy gap structure; nonlinear I-V characteristics; pseudogap;

D O I：

10.1143/JJAP.35.L762

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

A series of unique current-voltage characteristics are observed as a function of temperature for a stack of 18 intrinsic tunnel Josephson junctions fabricated on an underdoped Bi2Sr2CaCu2O8 single crystal. The characteristics at low temperatures below T-c clearly show a superconducting energy gap of about 24 meV, which is suppressed significantly by the nonequilibrium superconductivity effect. On the other hand, the characteristics above T-c are nonlinear up to 180 K, which cannot be explained within the framework of conventional tunnel Josephson junctions. This nonlinearity is interpreted to provide evidence for the evolution of a pseudogap, or most likely a spin gap, in this system. The semiconductive temperature dependence of the c-axis resistivity is also explained consistently in terms of this pseudogap.

引用

收藏

页码：L762 / L765

页数：4

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