Abstract
Superconducting properties and magnetic ordering of pseudoquaternary Tb x Er 1− x Ni 2B 2C intermetallic compounds have been investigated by susceptibility, resistivity and magnetization measurements on polycrystalline samples. Tb-rich compounds display an additional metamagnetic transition which can be suppressed by magnetic fields as low as 50 mT. A sizable reduction of the saturation magnetization of pseudoquaternary compounds is observed with a minimum located near x=0.5. T c decreases with increasing Tb fraction up to x≈0.25, where superconductivity breaks down. The effect of composition fluctuations within the homogeneity range of the compound leads to two different types of materials with distinct T c for a given Tb/Er ratio. A depression of T N with decreasing Tb content is observed.
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