A superconducting transition temperature Tc of 3.8 K with an onset as high as 5.2-5.5 K was reported for quaternary borocarbide DyNi2B2C with a high antiferromagnetic Néel temperature TN around 10.1-10.8 K. No reentrant behavior was observed down to 0.3 K demonstrating a perfect coexistence between superconductivity and antiferromagnetic order. A superconducting upper critical field Hc2(0) of 3.0 kG, lower critical field Hc1(0) of 200 G and Ginzburg-Landau parameter κ of 3.7 were derived. A broad Tc transition points to a possible small Tc varying homogeneity range of DyNi2 - αB2 - βC1 - δ in the phase diagram. The magnetic entropy Sm of 10.3 J/mol K or 90% Rln 4 indicates antiferromagnetic ordering of Dy3+ with a quadruplet ground state in the tetragonal crystal field. Two field-induced weak-ferromagnetic-like transitions with a field of around 1 T were observed at 2 K.
ASJC Scopus subject areas