In-plane magnetic penetration depth in NbS(2)
- Others:
- Centre de recherche sur l'hétéroepitaxie et ses applications (CRHEA) ; Université Nice Sophia Antipolis (1965 - 2019) (UNS) ; COMUE Université Côte d'Azur (2015-2019) (COMUE UCA)-COMUE Université Côte d'Azur (2015-2019) (COMUE UCA)-Centre National de la Recherche Scientifique (CNRS)-Université Côte d'Azur (UCA)
- Institut des Matériaux Jean Rouxel (IMN) ; Université de Nantes - UFR des Sciences et des Techniques (UN UFR ST) ; Université de Nantes (UN)-Université de Nantes (UN)-Ecole Polytechnique de l'Université de Nantes (EPUN) ; Université de Nantes (UN)-Université de Nantes (UN)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)
- Max-Planck-Institut für Radioastronomie (MPIFR)
Description
We report on the temperature dependence of the in-plane magnetic penetration depth (λab) and first penetration field [Hf∝1/λab2(T) for H∥c] in 2H-NbS2 single crystals. An exponential temperature dependence is clearly observed in λab(T) at low temperature, marking 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-NbSe2, this gap (Δ1=1.1kBTc) is significantly smaller than the standard BCS weak-coupling value. At higher temperature, a larger gap (Δ2=1.8kBTc) has to be introduced to describe the data which are compatible with a two-gap model. The superconducting gaps are hence very similar in NbS2 and NbSe2 and we show here that both of them open in the strongly coupled Nb tubular sheets independent of whether or not a CDW is present.
Abstract
International audience
Additional details
- URL
- https://hal.archives-ouvertes.fr/hal-00849519
- URN
- urn:oai:HAL:hal-00849519v1
- Origin repository
- UNICA