Superconductivity at 31 K in Alkaline Metal-Doped Cobalt Oxides

Chin. Phys. Lett.

2003, Vol. 20

Issue (5): 725-728 DOI:

Original Articles

Superconductivity at 31 K in Alkaline Metal-Doped Cobalt Oxides

WEN Hai-Hu;YANG Hai-Peng;LU Xi-Feng;YAN Jing

National Laboratory for Superconductivity, Institute of Physics and Center for Condensed Matter Physics, Chinese Academy of Sciences, PO Box 603, Beijing 100080

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WEN Hai-Hu, YANG Hai-Peng, LU Xi-Feng et al 2003 Chin. Phys. Lett. 20 725-728

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Abstract By using a simple solid reaction method, we have fabricated alkaline metal doped cobalt oxides An_xCoO_2+δ (An = Na, K). The magnetic measurement shows a superconducting-like diamagnetic signal at 31 K based on a strong superparamagnetic signal. Below 31 K, the magnetization hysteresis loops contain a strong rough linear superparamagnetic background and a superconducting hysteresis. The typical magnetization hysteresis loops for a type-II superconductor are found. Preliminary resistive data also show a fast dropping of resistance below T_c. These give indication of superconductivity below 31 K in An_xCoO_2+δ (An = Na, K).

Keywords: 74.10.+v 74.20.Mn 74.25.Gz

Published: 01 May 2003

PACS:	74.10.+v	(Occurrence, potential candidates)
	74.20.Mn	(Nonconventional mechanisms)
	74.25.Gz	(Optical properties)

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https://cpl.iphy.ac.cn/ OR https://cpl.iphy.ac.cn/Y2003/V20/I5/0725

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