Manifestation of peak-dip-hump structure in tunneling spectra of cuprates: a study by extended d-wave pairing symmetry

Orifjon Ganiev (), Bakhrom Yavidov, Shuhrat Kalandarov, Ilhom Rahmonov and Rustam Tashkhodjaev
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Orifjon Ganiev: New Uzbekistan University
Bakhrom Yavidov: Nukus State Pedagogical Institute Named After Ajiniyaz
Shuhrat Kalandarov: Joint Institute for Nuclear Research
Ilhom Rahmonov: Joint Institute for Nuclear Research
Rustam Tashkhodjaev: Inha University in Tashkent

The European Physical Journal B: Condensed Matter and Complex Systems, 2023, vol. 96, issue 12, 1-17

Abstract: Abstract In this study, we examined the relationship between the angular and energy-dependent gap function and the peak-dip-hump structure observed in quasiparticle tunneling spectra within high-temperature superconductor–insulator–normal metal (HTSC-I-N) junctions. We analyzed the tunneling spectra in HTSC-I-N junctions, focusing on the peak-dip-hump structure, using the extended d-wave pairing symmetry and the polaron approach. We investigated two significant aspects of the tunneling spectra observed in experiments, namely, the temperature and doping-dependent evolution of the differential conductance. Furthermore, we estimated the dependence of the pseudogap on hole doping in the cuprate phase diagram by comparing the difference between the binding energies of large polarons and their Coulomb interaction energies. Our calculated results were then compared with experimental data. Importantly, we found a strong quantitative agreement between the theoretical predictions and the experimental observations in the considered cases. Graphic abstract

Date: 2023
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DOI: 10.1140/epjb/s10051-023-00627-7

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