Upper Critical Field and Irreversibility Line Determined by
Transport Measurement of the New Superconductor MgB<suB>2</suB>

Chin. Phys. Lett.

2001, Vol. 18

Issue (6): 823-825 DOI:

Original Articles

Upper Critical Field and Irreversibility Line Determined by Transport Measurement of the New Superconductor MgB₂

JIN Hao;WEN Hai-Hu;LI Shi-Liang;ZHAO Zhi-Wen;NI Yong-Ming;REN Zhi-An;CHE Guang-Can;YANG Hai-Peng;LIU Zhi-Yong;ZHENG Dong-Ning;ZHAO Zhong-Xian

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

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JIN Hao, WEN Hai-Hu, LI Shi-Liang et al 2001 Chin. Phys. Lett. 18 823-825

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Abstract Resistive transitions of the new superconductor MgB₂ are carried out under magnetic fields from 0 to 8 T. It is found that the irreversibility field H_irr(T) and the upper critical field H_c2(T) obtained are very close to those determined in the magnetic measurement. By using the Arrhenius activation law ρ = ρ₀exp(-U/k_BT), the activation barrier U has been determined by the low dissipation part of R(T) curves. It is found that U k_BT manifests a very weak thermal activation and thermal fluctuation effect. This may further indicate that the flux dynamics near H_irr(T) is induced by strong quantum fluctuation and tunneling of vortices.

Keywords: 74.25.Fy 74.60.Ge 74.70.Ad 74.25.Dw

Published: 01 June 2001

PACS:	74.25.Fy
	74.60.Ge
	74.70.Ad	(Metals; alloys and binary compounds)
	74.25.Dw	(Superconductivity phase diagrams)

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https://cpl.iphy.ac.cn/ OR https://cpl.iphy.ac.cn/Y2001/V18/I6/0823

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	JIN Hao
	WEN Hai-Hu
	LI Shi-Liang
	ZHAO Zhi-Wen
	NI Yong-Ming
	REN Zhi-An
	CHE Guang-Can
	YANG Hai-Peng
	LIU Zhi-Yong
	ZHENG Dong-Ning
	ZHAO Zhong-Xian

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