Magnetic field dependence of the density of states in the multiband superconductor $\beta$-Bi${}_2$Pd

Abstract

We present very low temperature scanning tunneling microscopy (STM) experiments on single crystalline samples of the superconductor $\beta$-Bi${}_2$Pd. We find a single fully isotropic superconducting gap. However, the magnetic field dependence of the intervortex density of states is higher than the one expected in a single gap superconductor, and the hexagonal vortex lattice is locked to the square atomic lattice. Such increase in the intervortex density of states and vortex lattice locking have been found in superconductors with multiple superconducting gaps and anisotropic Fermi surfaces. We compare the upper critical field $H_{c2}(T)$ obtained in our sample with previous measurements and explain available data within multiband supercondutivity. We propose that $\beta$-Bi${}_2$Pd is a single gap multiband superconductor. We anticipate that single gap multiband superconductivity can occur in other compounds with complex Fermi surfaces.

8 pages, 7 figures

References in corpus (10)

• Vortex Imaging in the pi-Band of Magnesium Diboride
• Superconducting density of states and vortex cores of 2H-NbS2
• Limits of the upper critical field in dirty two-gap superconductors
• A review of two-band superconductivity: materials and effects on the thermodynamic and reversible mixed-state properties
• Intrinsic atomic scale modulations of the superconducting gap of 2H-NbSe2
• Interpretation of scanning tunneling quasiparticle interference and impurity states in cuprates
• Superconductivity at 5.4 K in $\beta$-Bi${}_2$Pd
• Pressure dependence of superconducting critical temperature and upper critical field of 2H-NbS2
• Pauli Paramagnetic Effects on Vortices in Superconducting TmNi2B2C
• Type II superconductivity in SrPd2Ge2

Cited by in corpus (37)

• Superconducting Topological Surface States in Non-centrosymmetric Bulk Superconductor PbTaSe2
• Colloquium: Atomic spin chains on surfaces
• Experimental Observation of Topological Superconductivity and Majorana Zero Modes on beta-Bi2Pd Thin Films
• Probing magnetic interactions between Cr adatoms on the $\beta$-Bi${}_2$Pd superconductor
• Observation of Half-Quantum Flux in Unconventional Superconductor $\beta$-Bi${}_2$Pd
• Single gap superconductivity in beta-Bi2Pd
• Field dependence of the vortex core size probed by STM
• Fully gapped superconductivity in the topological superconductor beta-PdBi2
• Synthesis, characterization and physical properties of layered bismuthide PtBi${}_2$
• Electron-phonon coupling and pairing mechanism in $\beta$--Bi${}_2$Pd centrosymmetric superconductor
• Atomic Manipulation of In-gap States on the $\beta$-Bi${}_2$Pd Superconductor
• Probing the superconducting gap symmetry of $\alpha$-PdBi${}_2$: A penetration depth study
• Observation of a gel of quantum vortices in a superconductor at very low magnetic fields
• Tilted vortex cores and superconducting gap anisotropy in 2H-NbSe2
• Upper critical field of the noncentrosymmetric superconductor BiPd
• Evolution of the topologically protected surface states in superconductor $\beta$-Bi${}_2$Pd from the three-dimensional to the two-dimensional limit
• Chemical doping and high pressure studies of layered beta-PdBi2 single crystals
• Topological Phase Transition Under Pressure in the Topological Nodal Line Superconductor PbTaSe${}_2$
• Transport evidence for three dimensional topological superconductivity in doped $\beta$-PdBi${}_2$
• Experimental evidence of anomalously large superconducting gap on topological surface state of $\beta$-$\mathbf{B}{\mathbf{i}}_2\mathbf{Pd}$ film
• Simplified feedback control system for Scanning Tunneling Microscopy
• Evidence of zero point fluctuation of vortices in a very weakly pinned a-MoGe thin film
• Subsurface bending and reorientation of tilted vortex lattices in the bulk due to Coulomb-like repulsion at the surface
• Coherent coupling between vortex bound states and magnetic impurities in 2D layered superconductors
• Vortex creep at very low temperatures in single crystals of the extreme type-II superconductor Rh${}_9$In${}_4$S${}_4$
• Multiphase superconductivity in PdBi2
• Field dependence of the vortex-core sizes in dirty two-band superconductors
• Superconducting density of states of PtPb4
• Superconductivity in Bi based Bi2PdPt
• Low-temperature thermal expansion of the topological material candidates $\beta$-PtBi${}_2$ and $\beta$-Bi${}_2$Pd
• Diluted Yu-Shiba-Rusinov arrays on the $\beta$-Bi${}_2$Pd anisotropic superconductor
• Superconducting density of states and vortex lattice of LaRu${}_2$P${}_2$ observed by Scanning Tunneling Spectroscopy
• Anti-hyperuniform diluted vortex matter induced by correlated disorder
• Unconventional magnetization in the multiphase superconductor PdBi${}_2$
• Single-gap two-band superconductivity well above the Pauli limit in non-centrosymmetric TaIr${}_2$B${}_2$
• Superconductivity in centrosymmetric topological superconductor candidate TaC
• Ab initio study of orbital-selective superconductivity in $\gamma$-BiPd