Multi-gap nodeless superconductivity in nickel chalcogenide TlNi2Se2

Abstract

Low-temperature thermal conductivity measurements were performed on single crystals of TlNi${}_2$Se${}_2$, a nickel-chalcogenide heavy-electron superconductor with $T_c$ $\simeq$ 3.7 K. In zero field, the residual electronic contribution at $T$ $\to$ 0 K (${\kappa }_0/T$) was well separated from the total thermal conductivity, which is less than 0.45\% of its normal-state value. Such a tiny residual ${\kappa }_0/T$ is unlikely contributed by the nodal quasiparticles. Nodeless gap structure is supported by the very weak field dependence of ${\kappa }_0(H)/T$ in low magnetic fields. In the whole field range, ${\kappa }_0(H)/T$ exhibits an "$S$"-shape curve, as in the case of nickel pnictides BaNi${}_2$As${}_2$ and SrNi${}_2$P${}_2$. This common feature of nickel-based superconductors can be explained by multiple nodeless superconducting gaps.

arXiv comment5 pages, 3 figures

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Cited by in corpus (8)

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• ARPES measurements of the superconducting gap of Fe-based superconductors and their implications to the pairing mechanism
• Camelback-shaped band reconciles heavy electron behavior with weak electronic Coulomb correlations in superconducting TlNi2Se2
• Superconductivity in a new layered nickel-selenide CsNi2Se2
• Anomalous Pressure Dependence of the Superconducting Transition Temperature in TlNi${}_2$Se${}_{2-x}$S${}_x$
• Optical properties of TlNi2Se2: Observation of pseudogap formation
• Superconductivity and Disorder Effect in TlNi${}_2$Se${}_{2-x}$S${}_x$ crystals
• Unconventional superconductivity in the nickel-chalcogenide superconductor, TlNi${}_2$Se${}_2$