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We report superconductivity in as-synthesized Nb2PdSe5, which is similar to a recently discovered Nb2PdS5 compound having very high upper critical field, clearly above the Pauli paramagnetic limit Zhang et al. (Sci. Rep. 3:1446, 2013). A bulk polycrystalline Nb2PdSe5 sample is synthesized by a solid-state reaction route in a phase-pure structure. The structural characterization has been done by X-ray diffraction, followed by Rietveld refinements, which revealed that the Nb2PdSe5 sample is crystallized in a monoclinic structure within the space group C2/m. Structural analysis revealed the formation of sharing of one-dimensional PdSe2 chains. Electrical and magnetic measurements confirmed the superconductivity in Nb2PdSe5 compound at 5.5 K. Detailed magneto-resistance results exhibited the value of upper critical field to be around 8.2 T. The estimated Hc2(0) is within the Pauli paramagnetic limit, which is unlike the Nb2PdS5.

Superconductivity at 5.5 K in Nb2PdSe5 Compound