Orbital-Selective High-Temperature Cooper Pairing Developed inthe Two-Dimensional Limit
Research output: Contribution to journal › Journal article › Research › peer-review
For multiband superconductors, the orbital multiplicity yields orbitaldifferentiation in normal-state properties and can lead to orbital-selective spin-fluctuation Cooper pairing. The orbital-selective phenomenon has becomeincreasingly pivotal in clarifying the pairing"enigma", particularly for multibandhigh-temperature superconductors. Meanwhile, in one-unit-cell (1-UC) FeSe/SrTiO3, since the standard electron-hole Fermi pocket nesting scenario isinapplicable, the actual pairing mechanism is subject to intense debate. Here, bymeasuring high-resolution Bogoliubovquasiparticle interference, we reportobservations of highly anisotropic magnetic Cooper pairing in 1-UC FeSe.Theoretically, it is important to incorporate orbitally selective effects of electroniccorrelations within a spin-fluctuation pairing calculation, where the dxyorbitalbecomes coherence-suppressed. The resulting pairing gap is compatible with theexperimentalfindings, which suggests that high-TcCooper pairing with orbitalselectivity applies to 2D-limit 1-UC FeSe. Ourfindings imply the general existence of orbital selectivity in iron-basedsuperconductors and the universal significance of electron correlations in high-Tcsuperconductors
Original language | English |
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Journal | Nano Letters |
Volume | 22 |
Issue number | 8 |
Pages (from-to) | 3245-3251 |
Number of pages | 7 |
ISSN | 1530-6984 |
DOIs | |
Publication status | Published - 27 Apr 2022 |
- one-unit-cell FeSe, SrTiO3, Bogoliubov quasiparticle interference, self-energy, orbital selectivity, Cooper pairing, SUPERCONDUCTIVITY, FESE, LIFETIME
Research areas
Links
- https://arxiv.org/ftp/arxiv/papers/2112/2112.00383.pdf
Submitted manuscript
ID: 315529981