The new class of superconducting quaternary R-T-B-C systems (R= rare earth, T = Ni, Pd)

Gupta, L. C. ; Nagarajan, R. ; Godart, C. ; Dhar, S. K. ; Mazumdar, Chandan ; Hossain, Zakir ; Levy-Clement, C. ; Padalia, B. D. ; Vijayaraghavan, R. (1994) The new class of superconducting quaternary R-T-B-C systems (R= rare earth, T = Ni, Pd) Physica C: Superconductivity, 235-240 . pp. 150-153. ISSN 0921-4534

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Our discovery of superconductivity (SC) at an elevated temperature (~12K) in the system Y-Ni-B-C [1-4] has opened up an entirely new area of research in superconductivity in intermetallics. Our specific heat measurements show that YNi2B2C is strongly-coupled superconductor. SC and magnetism coexist, below 7K, in ErNi2B2C. From μ-SR studies, carried out on LuNi2B2C and TmNi2B2C, Ni-atoms are inferred to carry local moment. Substituents such as Th and Gd (at the Y-sites) and Fe and Co (at the Ni-sites) depress Tc of YNi2B2C. Superconductivity is quenched in Y0.9U0.1Ni2B2C. In multiphase Y-Pd-B-C system (obtained by replacing Ni by Pd), we observe two SC-transitions, Tc ~22K and 10K. LuPd4BC0.2 has a minority SC-phase with Tc ~10 K. Microwave absorption has been used to study the temperature dependence of the lower critical field, Hcl, in YPd5B3C0.35. ThNi2B2C, a multiphase material, exhibits SC at ~5K whereas two SC transitions are observed in ThPd2B2C (Tc~20K and 14K) and in ThPd4BC. No SC is observed in U-based Ni-and Pd-borocarbides and in YT2B2C (T = Co, Rh, Ir and Os) down to 4.2K.

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