Abstract
The ac susceptibility, the low field magnetization and neutron diffraction experiment have been performed for concentrations 0.1<x<1. For x<0.4 the typical spinglass properties have been observed: cusp in the susceptibility, the cusp is affected by small static magnetic fields of a few hundred Gauss. The thermal remanent magnetization has also been detected. However properties are also present for the high concentration x=0.6 or 0.8. Neutron diffraction experiments at the D1B of the ILL show that there exists no sharp change from long range order to the spinglass regime. For higher x values approximately 80% of the Er ions form long range order whereas for x<40% most of the ions are in the frozen paramagnetic state. The magnetic phase diagram for the whole concentration range is discussed.
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