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Magnetic and neutron diffraction study on iridium(IV) perovskites Sr 2 LnIrO 6 (Ln = Ce, Tb)

2000; IOP Publishing; Volume: 12; Issue: 14 Linguagem: Inglês

10.1088/0953-8984/12/14/302

1361-648X

Daijitsu Harada, Makoto Wakeshima, Yukio Hinatsu, Kenji Ohoyama, Yasuo Yamaguchi,

Physics of Superconductivity and Magnetism

Powder neutron diffraction measurements have been performed for two tetravalent iridium perovskites, Sr2 CeIrO6(TN = 21 K) and Sr2 TbIrO6(TN = 51 K). It is found that moments of Tb4+in these ordered perovskites are stacked antiferromagnetically along the c -axis, and the magnetic structure is of type I. The ordered magnetic moment of Tb4+is 4.96 µB at 28 K and 6.60 µB at 2 K. From magnetic susceptibility measurements on Sr2 Cex Tb1-x IrO6 , the antiferromagnetic transition temperatures decrease greatly with decreasing Tb4+ion, which indicates that the pathway of such interactions must involve the Tb4+ions.