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Article Dans Une Revue Physical Review B: Condensed Matter and Materials Physics (1998-2015) Année : 2011

In-plane magnetic penetration depth in NbS2

Pascale Diener
Maxime Leroux
Laurent Cario
Thierry Klein
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Résumé

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 $H\|c$) 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 ( $\Delta_{1}=1.1\, k_{B}T_{c}$) is significantly smaller than the standard BCS weak coupling value. At higher temperature, a larger gap ($\Delta_{2}=1.8\, k_{B}T_{c}$) 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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Dates et versions

hal-00771744 , version 1 (09-01-2013)

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Pascale Diener, Maxime Leroux, Laurent Cario, Thierry Klein, Pierre Rodiere. In-plane magnetic penetration depth in NbS2. Physical Review B: Condensed Matter and Materials Physics (1998-2015), 2011, 84 (5), pp.054531. ⟨10.1103/PhysRevB.84.054531⟩. ⟨hal-00771744⟩
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