Pair-breaking scattering interference as a mechanism for superconducting gap modulation

Abstract

We propose the ``pair-breaking scattering interference" as a general source of coherence peak modulations in superconductors. Assuming this mechanism, we present a simple physical picture for the coherence peak modulations in overdoped cuprate Bi${}_2$Sr${}_2$Ca${}_2$Cu${}_3$O${}_{10+\delta }$ (Bi-2223), ferromagnetic iron pnictide EuRbFe${}_4$As${}_4$ (Eu-1144), and kagome metals $A$V${}_3$Sb${}_5$ ($A=$ K, Rb, and Cs). Specifically, we explain the wavevectors, the particle-hole symmetry, and the dependence on the internal or external Zeeman-field of the coherence peak modulations. This work is intended as a cautious reminder to the scientific community when asserting the existence of a pair density wave phenomenon in the absence of tunneling conductance modulations in the normal state.

6+6 pages, 3+2 figures

References in corpus (16)

• Roton pair density wave and unconventional strong-coupling superconductivity in a topological kagome metal
• Cascade of correlated electron states in a kagome superconductor CsV3Sb5
• Complex charge density waves at Van Hove singularity on hexagonal lattices: Haldane-model phase diagram and potential realization in kagome metals ${\text{AV}}_3{\text{Sb}}_5$
• Multiband superconductivity with sign-preserving order parameter in kagome superconductor CsV3Sb5
• Tunable nodal kagome superconductivity in charge ordered RbV3Sb5
• Detection of a Pair Density Wave State in UTe${}_2$
• Chern Fermi pocket, topological pair density wave, and charge-4e and charge-6e superconductivity in kagome superconductors
• Discovery of a pair density wave state in a monolayer high-Tc iron-based superconductor
• Chiral kagome superconductivity modulations with residual Fermi arcs in KV3Sb5 and CsV3Sb5
• Smectic Pair Density Wave Order in EuRbFe4As4
• Superconductivity in high-$T_c$ and related strongly correlated systems from variational perspective: Beyond mean field theory
• Multidome superconductivity in charge density wave kagome metals
• Evidence chain for time-reversal symmetry-breaking kagome superconductivity
• Small Fermi pockets intertwined with charge stripes and pair density wave order in a kagome superconductor
• Particle-hole asymmetric superconducting coherence peaks in overdoped cuprates
• Topological magnetic order and superconductivity in EuRbFe${}_4$As${}_4$

Cited by in corpus (6)

• Observation of superconducting pair density modulation within lattice unit cell
• Switchable chiral 2x2 pair density wave in pure CsV3Sb5
• Phase-sensitive evidence for pair density waves in a kagome superconductor
• The Low-Temperature Phenomenology of Gap Inhomogeneity in the Cuprate Superconductors: High-Energy Granularity, Low-Energy Homogeneity, and Spectral Kinks
• Topological pair density waves in kagome superconductors
• Visualizing Pair-breaking Scattering Interference in Bulk FeSe