Strong-coupling superconductivity in layered nickel-based LaO$_{1-x}$F$_x$NiAs

Details Strong-coupling superconductivity in layered nickel-based LaO$_{1-x}$F$_x$NiAs Strong-coupling superconductivity in layered nickel-based LaO$_{1-x}$F$_x$NiAs

2008-03-18

arxiv.org/abs/0803.2572v2

Phys. Rev. B, 78, 060504(R), 2008

Physics

Condensed Matter

Superconductivity

4 pages, 4 figures

Scientific paper

10.1103/PhysRevB.78.060504

A series of layered nickel-based LaO$_{1-x}$F$_x$NiAs compounds with x=0 to 0.15 are synthesized by solid state reactions. The pure LaONiAs exhibits bulk superconductivity with Tc $\sim$ 2.75 K. Partial substitution of oxygen by fluorine increases the transition temperature to $\sim 3.8$ K. The LaO$_{0.9}$F$_{0.1}$NiAs sample shows a sharp superconducting transition and a sharp specific heat jump at the critical temperature. The magnitude of the specific heat jump is much larger than that expected from the weak-coupling BCS theory, indicating that this superconductor is in the strong coupling regime. Furthermore, the temperature dependence of the specific heat deviates strongly from the theoretical result for the single-band s- or d-wave superconductor, but shows some character of a multi-gap system.

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