Penetration depth study of superconducting gap structure of 2\textit{H}-NbSe${}_2$

Abstract

We report measurements of the temperature dependence of both in-plane and out-of-plane penetration depths (${\lambda }_a$ and ${\lambda }_c$ respectively) in 2\textit{H}-NbSe${}_2$. Measurements were made with a radio-frequency tunnel diode oscillator circuit at temperatures down to 100 mK. Analysis of the anisotropic superfluid density shows that a reduced energy gap is located on one or more of the quasi-two-dimensional Nb Fermi surface sheets rather than on the Se sheet, in contrast to some previous reports. This result suggests that the gap structure is not simply related to the weak electron-phonon coupling on the Se sheet and is therefore important for microscopic models of anisotropic superconductivity in this compound.

4 pages, Revtex

References in corpus (1)

• Quasi-Particle Spectra, Charge-Density-Wave, Superconductivity and Electron-Phonon Coupling in 2H-NbSe2

Cited by in corpus (42)

• Superconducting density of states and vortex cores of 2H-NbS2
• Universal Josephson diode effect
• Two energy gaps and Fermi surface 'arcs' in NbSe2
• Evidence for nodal superconductivity in LaFePO
• Superfluid density and specific heat within self-consistent scheme for two-band superconductor
• Evidence for Two Gaps and Breakdown of the Uemura Plot in Ba${}_{0.6}$K${}_{0.4}$Fe${}_2$As${}_2$ Single Crystals
• Crossover from weak to strong pairing in unconventional superconductors
• Specific heat measurements of the gap structure of the organic superconductors kappa-(ET)_2Cu[N(CN)_2]Br and kappa-(ET)_2Cu(NCS)_2
• Magnetic penetration depth of single crystal SmFeAsO_{1-x}F_y: a fully gapped superconducting state
• Orbital Fulde-Ferrell-Larkin-Ovchinnikov state in an Ising superconductor
• Intrinsic atomic scale modulations of the superconducting gap of 2H-NbSe2
• Experimental evidence for a two-gap structure of superconducting NbSe_2: a specific heat study in external magnetic fields
• Muon spin rotation studies of electronic excitations and magnetism in the vortex cores of superconductors
• Primary role of the barely occupied states in the charge density wave formation of NbSe2
• Experimental evidence for a two-band superconducting state of NbSe2 single crystals
• Scanning tunneling spectroscopy with superconducting tips of Al
• Van der Waals pi Josephson junctions
• Anisotropic fluctuations and quasiparticle excitations in FeSe_0.5Te_0.5
• Magnetic field dependence of vortex activation energy: a comparison between MgB2, NbSe2 and Bi2Sr2Ca2Cu3O10 superconductors
• Signature of multigap nodeless superconductivity in fluorine-doped NdFeAsO
• Large magnetic penetration depth and thermal fluctuations in a Ca${}_{10}$(Pt${}_3$As${}_8$)[(Fe${}_{1-x}$Pt${}_x$)${}_2$As${}_2$]${}_5$ (x=0.097) single crystal
• Multi-Band Superconductivity in Strongly Hybridized 1T'-WTe${}_2$/NbSe${}_2$ Heterostructures
• Superconductivity, pairing symmetry, and disorder in the doped topological insulator Sn${}_{1-x}$In${}_x$Te for x $\ge$ 0.10
• London penetration depth measurements using tunnel diode resonators
• Magnetic field-induced gapless state in multiband superconductors
• Ising superconductivity: a first-principles perspective
• Possible unconventional pairing in $(\text{Ca,Sr}{)}_3(\text{Ir,Rh}{)}_4{\text{Sn}}_{13}$ superconductors revealed by controlling disorder
• Meissner effect induced Majorana zero modes at small magnetic field
• Charge Density Wave and Superconducting Properties in Single Crystals of Lu5Ir4Si10
• Nodeless superconductivity in quasi-one-dimensional Nb2PdS5: A muSR study
• Vortex Lattice Melting of a NbSe2 single grain probed by Ultrasensitive Cantilever Magnetometry
• Fabry-Perot superconducting diode
• Probing Vortex Dynamics in 2D Superconductors with Scanning Quantum Microscope
• Two-Gap Superconductivity in CaFe_{0.88}Co_{0.12}AsF Revealed by Temperature Dependence of the Lower Critical Field H_{c1}^c(T)
• Effects of 3 MeV Proton Irradiation on Superconductivity and CDW in 2H-NbSe2 Single Crystals
• Full superconducting gap in the candidate topological superconductor In${}_{1-x}$Pb${}_x$Te for x = 0.2
• Nodeless superconductivity in 4H${}_b$-TaS${}_2$ with broken time reversal symmetry
• Two characteristic contributions to the superconducting state of 2$H$-NbSe${}_2$
• S-shaped suppression of the superconducting transition temperature in Cu-intercalated NbSe2
• Tuning metal/superconductor to insulator/superconductor coupling via control of proximity enhancement between NbSe${}_2$ monolayers
• Linear magnetic susceptibility of anisotropic superconductors of cuboidal shape
• Microscopic Insights into London Penetration Depth: Application to CeCoIn${}_5^{}$