Josephson Effect in MgB2: Large IcRN Product and Superconducting Energy Gap

Chin. Phys. Lett.

2001, Vol. 18

Issue (9): 1254-1255 DOI:

Original Articles

Josephson Effect in MgB₂: Large I_cR_N Product and Superconducting Energy Gap

XUAN Yi;LI Zhuang-Zhi;TAO Hong-Jie;REN Zhi-An;CHE Guang-Can;ZHAO Bai-Ru;ZHAO Zhong-Xian

National Laboratory for Superconductivity, Institute of Physics and Center for Condensed Mater Physics, Chinese Academy of Sciences, Beijing 100080

Cite this article:

XUAN Yi, LI Zhuang-Zhi, TAO Hong-Jie et al 2001 Chin. Phys. Lett. 18 1254-1255

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Abstract We report the observation of the Josephson effect on the newly
discovered superconductor MgB₂ with break-junction technique. Similar to the conventional superconductors, the I - V curve can be fitted with the resistively shunted junction model including the noise effect, and a large characteristic voltage V_c = I_cR_N = 9.6 meV was obtained. The energy gap determined by the Ambegaokar-Baratoff relation with the fitted V_c is consistent with the Bardeen-Cooper-Schrieffer weak-coupling value well. Our result implies that the superconductor MgB₂ is a promising material for the Josephson device applications.

Keywords: 74.50.+r 74.70.Ad 74.80.Fp

Published: 01 September 2001

PACS:	74.50.+r	(Tunneling phenomena; Josephson effects)
	74.70.Ad	(Metals; alloys and binary compounds)
	74.80.Fp

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https://cpl.iphy.ac.cn/ OR https://cpl.iphy.ac.cn/Y2001/V18/I9/01254

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	XUAN Yi
	LI Zhuang-Zhi
	TAO Hong-Jie
	REN Zhi-An
	CHE Guang-Can
	ZHAO Bai-Ru
	ZHAO Zhong-Xian

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