In-plane magnetic penetration depth in NbS${}_2$

Abstract

We report on the temperature dependence of the in plane magnetic penetration depth (${\lambda }_{ab}$) and first penetration field ($H_f\propto 1/{\lambda }_{ab}^2(T)$ for $H\Vert c$) in 2H-NbS${}_2$ single crystals. An exponential temperature dependence is clearly observed in ${\lambda }_{ab}$(T) at low temperature, signing the presence of a fully open superconducting gap. This compound is the only superconducting 2H-dichalcogenide which does not develop a charge density wave (CDW). However as previously observed in 2H-NbSe${}_2$, this gap (${\Delta }_1=1.1k_B{T}_c$) is significantly smaller than the standard BCS weak coupling value. At higher temperature, a larger gap (${\Delta }_2=1.8k_B{T}_c$) has to be introduced to describe the data which are compatible with a two gap model. The superconducting gaps are hence very similar in NbS${}_2$ and NbSe${}_2$ and we show here that both of them open in the strongly coupled Nb tubular sheets independently of the presence of a CDW or not.

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• Evolution of superconductivity in ultrathin NbS2
• Traces of Charge Density Waves in NbS${}_2$
• Zero-bias conductance peak in detached flakes of superconducting 2H-TaS${}_2$ probed by scanning tunneling spectroscopy
• Fermiology and electron-phonon coupling in the 2H and 3R polytypes of NbS${}_2$
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• From orbital to paramagnetic pair breaking in layered superconductor 2H-NbS${}_2$
• Pressure-Induced Enhancement of Superfluid Density in Transition Metal Dichalcogenides with and without Charge Density Wave
• The Anisotropy of Thermal Activation Energy of 2H-NbS${}_2$