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

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arxiv 2310.06024 v2 pith:MVSPOEIR submitted 2023-10-09 cond-mat.supr-con cond-mat.mes-hallcond-mat.str-el

Zhi-Qiang Gao , Yu-Ping Lin , Dung-Hai Lee This is my paper · ORCID
classification cond-mat.supr-concond-mat.mes-hallcond-mat.str-el
keywords modulationscoherencepeakinterferencemechanismpair-breakingscatteringabsence
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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.

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  1. Time-reversal symmetry breaking, collective modes, and Raman spectrum in pair-density-wave states

    cond-mat.str-el 2025-01 conditional novelty 6.0 of 10

    Coexisting pair-density-wave and uniform d-wave superconducting order generates a sharp, Raman-active Higgs mode and breaks time-reversal symmetry.

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