Disappearance and reappearance of weak ferromagnetism in Ba2Cu3-x(Ni,Zn)(x)O4Cl2 (0 <= x <= 0.1) single crystals at low temperature

摘要

Magnetization measurements have been performed on the single crystal of layered copper oxychloride Ba2Cu3-x(Ni,Zn)(x)O4Cl2 (0less than or equal toxless than or equal to0.1) containing two types of Cu site in the Cu3O4 plane. The weak ferromagnetic moment observed in Ba2Cu3O4Cl2 decreased drastically by introducing even a small amount of the dopant Ni such as 0.03 mol. In order to explain the above result, it is necessary to introduce a long-range interaction in the Cu3O4 plane as well as the Dzyalosinsky-Moriya or the pseudodipolar interaction (C) 2002 Elsevier Science B.V. All rights reserved. [References: 6]