Novel Transitions in Doped Mott-Insulator K<suB>x</suB>CoO<suB>2</suB>

Chin. Phys. Lett.

2003, Vol. 20

Issue (5): 729-730 DOI:

Original Articles

Novel Transitions in Doped Mott-Insulator K_xCoO₂

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

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

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YANG Hai-Peng, LU Xi-Feng, WEN Hai-Hu 2003 Chin. Phys. Lett. 20 729-730

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Abstract By measuring the temperature dependence of the magnetic susceptibility, two distinct transitions have been observed in potassium doped cobalt oxide K_xCoO₂ (x = 0.2-1.0). The transition around 125 K corresponds to a phase transition between a weak ferromagnetic plus a strong superparamagnetic phase (below 125 K) and a superparamagnetic phase (above 125 K). The susceptibility above the Curie point T_c cannot be described by the Curie-Weise law, being consistent with the superparamagnetism. Magnetization-hysteresis-loops have been measured in different temperature regions to uncover the underlying physics. The second transition near 30.8 K shows a strong novelty.

Keywords: 74.10.+v 74.20.Mn 75.47.Pq 74.25.Gz

Published: 01 May 2003

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

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https://cpl.iphy.ac.cn/ OR https://cpl.iphy.ac.cn/Y2003/V20/I5/0729

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