MAGNETIC PHASE TRANSITIONS OF T-PHASE Gd2CuO4 SINGLE CRYSTAL

I. M. Sutjahja (Van der Waals-Zeeman lnstituut, Universiteit van Amsterdam, Valckenierstraat 65, 1018 XE, Amsterdam Department of Physics, Institut Teknologi Bandung Jl. Ganesha 10, Bandung 40132)
M. Diantoro (Department of Physics, Institut Teknologi Bandung Jl. Ganesha 10, Bandung 40132 Department of Physics, Universitas Negeri Malang Jl. Surabaya 6, Malang 65145)
A. A. Nugroho (Van der Waals-Zeeman lnstituut, Universiteit van Amsterdam, Valckenierstraat 65, 1018 XE, Amsterdam Department of Physics, Institut Teknologi Bandung Jl. Ganesha 10, Bandung 40132)
A. Menovsky (Van der Waals-Zeeman lnstituut, Universiteit van Amsterdam, Valckenierstraat 65, 1018 XE, Amsterdam)
M. O. Tjia (Department of Physics, Institut Teknologi Bandung Jl. Ganesha 10, Bandung 40132)

Jurnal Sains Materi Indonesia
Vol 3, No 2: FEBRUARI 2002

MAGNETIC PHASE TRANSITIONS OF T-PHASE Gd2CuO4 SINGLE CRYSTAL. The magnetic properties of T‘-phase Gd2CuO4 Single crystal grown by the Traveling Solvent Floating Zone (TSFZ) method have been investigated by means of ac-magnetic susceptibility and dc-magnetization measurements. The result of these studies revealed an anomaly in the temperature dependent magnetization at temperature of T = 6.5, 290 and 20 K, associated respectively with the long-range antiferromagnetic ordering of the Gd and Cu ions and Cu- spin reorientation transitions. The complex magnetic structure of this compound shown by the weak ferromagnetic behavior below the copper ordering temperature (TN(Cu) = 290 K) is induced by an effective field due to exchange interactions between the ordered copper moments and the rare-earth ions. These results, together with the previous neutron diffraction measurement, establishes the existence of ferromagnetic Gd layers in the ab-plane which are stacked antiferromagnetically along c-direction, indicating a quasi—two dimensional antiferromagnetic nature of Gd2CuO4.