Abstract
The magnetic and superconducting properties of the intermetallic compounds Y 1− x RE x Ni 2B 2C (RE=Gd, Dy, Ho, Er; 0≤ x≤1.0) have been measured over wide temperature and magnetic field ranges. The existence of the RE 3+ paramagnetic ions causes the depression of superconductivity, which can be well interpreted by the Abrikosov–Gor`kov magnetic pair-breaking theory. The corresponding magnetic-ordering temperature increases with increasing magnetic moment concentration while the superconducting transition temperature decreases. The long-range magnetic-ordering is mainly caused by the Ruderman-Kittel-Kasuya-Yosida indirect exchange interaction via conduction electrons. This indirect exchange coupling strongly depends on the RE 3+-moment separation and de Gennes factor. This experiment demonstrates that coexistence of long-range magnetic-ordering and superconductivity in Y 1− x RE x Ni 2B 2C compounds is possible.
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