Unconventional superconductivity near a nematic instability in a multi-orbital system

Autor: Kazi Ranjibul Islam, Andrey Chubukov
Jazyk: angličtina
Rok vydání: 2024
Předmět:
Zdroj: npj Quantum Materials, Vol 9, Iss 1, Pp 1-7 (2024)
Druh dokumentu: article
ISSN: 2397-4648
DOI: 10.1038/s41535-024-00638-2
Popis: Abstract We analyze superconductivity in a multi-orbital fermionic system near the onset of a nematic order, using doped FeSe as an example. We associate nematicity with spontaneous polarization between d xz and d yz orbitals. We derive pairing interaction, mediated by soft nematic fluctuations, and show that it is attractive, and its strength depends on the position on the Fermi surface. As the consequence, right at the nematic quantum-critical point (QCP), superconducting gap opens up at T c only at special points and extends into finite arcs at T
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