Energy gap suppression and excess current in Tl2Ba2CaCu2O8 intrinsic Josephson junctions

doi:10.1088/1674-1056/22/5/057402

Abstract Intrinsic Josephson junctions in misaligned Tl₂Ba₂CaCu₂O₈ thin film were fabricated on LaAlO₃ substrate. The temperature dependence of the critical current is investigated around liquid nitrogen temperature. In the current voltage characteristic, large voltage jump and free of resistive branch are observed, which shows good consistency with the intrinsic Josephson junctions. By analyzing the large gap voltage in the curve, great suppression of the energy gap is found. Through discussing the temperature dependence of the gap voltage in liquid nitrogen temperature, it is showed that this phenomenon can be caused by the nonequilibrium quasiparticle injection. The temperature influence on the excess current also confirms the nonequlibrium effect.

Keywords: intrinsic Josephson junctions current voltage characteristics energy gap excess current

Received: 27 November 2012
Revised: 21 December 2012
Accepted manuscript online:

PACS:	74.72.-h	(Cuprate superconductors)
	74.50.+r	(Tunneling phenomena; Josephson effects)

Fund: Project supported by the National Natural Science Foundation of China (Grant Nos. 61176119, 61171028, 51002081, and 61101018) and the Fundamental Research Funds for the Central Universities of China.

Corresponding Authors: He Ming
E-mail: heming@nankai.edu.cn

Cite this article:

Wang Pei (王培), Xie Wei (解伟), Hu Lei (胡磊), Liu Xin (刘欣), Zhao Xin-Jie (赵新杰), He Ming (何明), Ji Lu (季鲁), Zhang Xu (张旭), Yan Shao-Lin (阎少林) Energy gap suppression and excess current in Tl₂Ba₂CaCu₂O₈ intrinsic Josephson junctions 2013 Chin. Phys. B 22 057402

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Energy gap suppression and excess current in Tl2Ba2CaCu2O8 intrinsic Josephson junctions

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Energy gap suppression and excess current in Tl₂Ba₂CaCu₂O₈ intrinsic Josephson junctions