Tunable vortex bound states in multiband CsV3Sb5-derived kagome superconductors

Abstract

Vortices and bound states offer an effective means of comprehending the electronic properties of superconductors. Recently, surface dependent vortex core states have been observed in the newly discovered kagome superconductors CsV3Sb5. Although the spatial distribution of the sharp zero energy conductance peak appears similar to Majorana bound states arising from the superconducting Dirac surface states, its origin remains elusive. In this study, we present observations of tunable vortex bound states (VBSs) in two chemically doped kagome superconductors Cs(V1-xTrx)3Sb5 (Tr=Ta or Ti), using low temperature scanning tunneling microscopy/spectroscopy. The CsV3Sb5-derived kagome superconductors exhibit full gap pairing superconductivity accompanied by the absence of long range charge orders, in contrast to pristine CsV3Sb5. Zero energy conductance maps demonstrate a field-driven continuous reorientation transition of the vortex lattice, suggesting multiband superconductivity. The Ta doped CsV3Sb5 displays the conventional cross shaped spatial evolution of Caroli de Gennes Matricon bound states, while the Ti doped CsV3Sb5 exhibits a sharp, non split zero bias conductance peak (ZBCP) that persists over a long distance across the vortex. The spatial evolution of the non split ZBCP is robust against surface effects and external magnetic field but is related to the doping concentrations. Our study reveals the tunable VBSs in multiband chemically doped CsV3Sb5 system and offers fresh insights into previously reported Y shaped ZBCP in a non quantum limit condition at the surface of kagome superconductor.

arXiv commentaccepted by Science Bulletin DOI:10.1016/j.scib.2024.01.036

References in corpus (35)

• Fault-tolerant quantum computation by anyons
• Non-Abelian Anyons and Topological Quantum Computation
• Superconducting proximity effect and Majorana fermions at the surface of a topological insulator
• CsV${}_3$Sb${}_5$: a ${\mathbb{Z}}_2$ topological kagome metal with a superconducting ground state
• Roton pair density wave and unconventional strong-coupling superconductivity in a topological kagome metal
• Majorana mode in vortex core of Bi2Te3/NbSe2 topological insulator-superconductor heterostructure
• Cascade of correlated electron states in a kagome superconductor CsV3Sb5
• Time-reversal symmetry-breaking charge order in a kagome superconductor
• Fermion zero modes on vortices in chiral superconductors
• Double superconducting dome and triple enhancement of Tc in the kagome superconductor CsV3Sb5 under high pressure
• Three-dimensional charge density wave and robust zero-bias conductance peak inside the superconducting vortex core of a kagome superconductor CsV${}_3$Sb${}_5$
• Unusual competition of superconductivity and charge-density-wave state in a compressed topological kagome metal
• Non-Abelian Topological Orders and Majorana Fermions in Spin-Singlet Superconductors
• Ginzburg-Landau theory of vortices in a multi-gap superconductor
• Multiband superconductivity with sign-preserving order parameter in kagome superconductor CsV3Sb5
• Twofold symmetry of $c$-axis resistivity in topological kagome superconductor CsV${}_3$Sb${}_5$ with in-plane rotating magnetic field
• Observation of half-integer level shift of vortex bound states in an iron-based superconductor
• Mixed-State Quasiparticle Spectrum for d-wave Superconductors
• Self-consistent electronic structure of a $d_{x^2-y^2}$ and a $d_{x^2-y^2}+i{d}_{xy}$ vortex
• Scanning Tunneling Microscopy/Spectroscopy of Vortices in LiFeAs
• Anisotropic superconducting properties of Kagome metal CsV3Sb5
• Nodeless electron pairing in CsV${}_3$Sb${}_5$-derived kagome superconductors
• Experimental Observation of Topological Superconductivity and Majorana Zero Modes on beta-Bi2Pd Thin Films
• A unique van Hove singularity in kagome superconductor CsV${}_{3-x}$Ta${}_x$Sb${}_5$ with enhanced superconductivity
• Evolution of density of states and spin-resolved "checkerboard" pattern associated with Majorana bound state
• Unidirectional coherent quasiparticles in the high-temperature rotational symmetry broken phase of AV3Sb5 kagome superconductors
• Pressure-induced dimensional crossover in a kagome superconductor
• How the vortex lattice of a superconductor becomes disordered: a study by scanning tunneling spectroscopy
• Generic First Order Orientation Transition of Vortex Lattices in Type II Superconductors
• Metastable Vortex Lattice Phases in Superconducting MgB2
• Anisotropic non-split zero-energy vortex bound states in a conventional superconductor
• Structure of vortex-bound states in spin-singlet chiral superconductors
• Zero-Energy Modes on Superconducting Bismuth Islands Deposited on Fe(Te,Se)
• Topological Mid-gap States of px+ipy Topological Superconductor with Vortex superlattice
• Reversible ordering and disordering of the vortex lattice in UPt3

Cited by in corpus (5)

• Emergent superconductivity and pair density wave at antiphase boundaries of charge density wave order in kagome metals
• Revealing the orbital origins of exotic electronic states with Ti substitution in kagome superconductor CsV3Sb5
• Conventional Superconductivity in the Doped Kagome Superconductor Cs(V0.86Ta0.14)3Sb5 from Vortex Lattice Studies
• Visualization of Unconventional Rashba Band and Vortex Zero Mode in Topopogical Superconductor Candidate AuSn${}_4$
• Atomic Visualization of Bulk and Surface Superconductivity in Weyl Semimetal γ-PtBi2