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Structural, superconducting, and magnetic properties of YNi2B2C and ErNi2B2C.

Discovery of a quaternary superconducting system Y-Ni-B-C has been reported recently. Our structural studies on YNi 2 B 2 C (T c ≊15.5 K) reveal large and anisotropic thermal vibrations of C atoms in the Y-C plane of the structure. No crystallographic phase transition is observed down to 50 K. Our specific-heat data suggest that YNi 2 B 2 C is a strong-coupling superconductor. Results of our resistivity, magnetic, and specific-heat data clearly suggest coexistence of superconductivity and magnetism (of Er spins) in ErNi 2 B 2 C (T c ≊10.5 K) below ≊7 K.