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

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dc.creatorLi, Z.
dc.creatorChen, G. F.
dc.creatorDong, J.
dc.creatorLi, G.
dc.creatorHu, W. Z.
dc.creatorWu, D.
dc.creatorSu, S. K.
dc.creatorZheng, P.
dc.creatorXiang, T.
dc.creatorWang, N. L.
dc.creatorLuo, J. L.
dc.date2008-03-18
dc.date2008-04-07
dc.date.accessioned2026-07-07T09:56:58Z
dc.date.available2026-07-07T09:56:58Z
dc.descriptionA 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.
dc.description4 pages, 4 figures
dc.identifierhttps://arxiv.org/abs/0803.2572
dc.identifierhttp://arxiv.org/abs/0803.2572
dc.identifierPhys. Rev. B, 78, 060504(R), 2008
dc.identifierdoi:10.1103/PhysRevB.78.060504
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/167171
dc.subjectSuperconductivity
dc.subjectStrongly Correlated Electrons
dc.titleStrong-coupling superconductivity in layered nickel-based LaO$_{1-x}$F$_x$NiAs
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