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We report on structural and superconducting properties of La(3-x)R(x)Ni2B2N3where La is substituted by the magnetic rare-earth elements Ce, Pr, Nd. Thecompounds Pr3Ni2B2N3 and Nd3Ni2B2N3 are characterized for the first time.Powder X-ray diffraction confirmed all samples R3Ni2B2N3 with R = La, Ce, Pr,Nd and their solid solutions to crystallize in the body centered tetragonalLa3Ni2B2N3 structure type. Superconducting and magnetic properties ofLa(3-x)R(x)Ni2B2N3 were studied by resistivity, specific heat andsusceptibility measurements. While La3Ni2B2N3 has a superconducting transitiontemperature Tc ~ 14 K, substitution of La by Ce, Pr, and Nd leads to magneticpair breaking and, thus, to a gradual suppression of superconductivity.Pr3Ni2B2N3 exibits no long range magnetic order down to 2 K, Nd3Ni2B2N3 showsferrimagnetic ordering below T_C = 17 K and a spin reorientation transition toa nearly antiferromagnetic state at 10 K.

Structural, Superconducting and Magnetic Properties of La(3-x)R(x)Ni2B2N3 (R = Ce, Pr, Nd)