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Multi-atom quasiparticle scattering interference for superconductor energy-gap symmetry determination

Sharma, R.; Kreisel, A.; Sulangi, M. A.; Böker, J.; Kostin, A.; Allan, M. P.; Eisaki, H.; Böhmer, Anna E. 1; Canfield, P. C.; Eremin, I.; Séamus Davis, J. C.; Hirschfeld, P. J.; Sprau, P. O.
1 Institut für Quantenmaterialien und -technologien (IQMT), Karlsruher Institut für Technologie (KIT)

Complete theoretical understanding of the most complex superconductors requires a detailed knowledge of the symmetry of the superconducting energy-gap Δ$\frac{α}{k}$, for all momenta k on the Fermi surface of every band α. While there are a variety of techniques for determining |Δ$\frac{α}{k}$|, no general method existed to measure the signed values of Δ$\frac{α}{k}$. Recently, however, a technique based on phase-resolved visualization of superconducting quasiparticle interference (QPI) patterns, centered on a single non-magnetic impurity atom, was introduced. In principle, energy-resolved and phase-resolved Fourier analysis of these images identifies wavevectors connecting all k-space regions where Δ$\frac{α}{k}$ has the same or opposite sign. But use of a single isolated impurity atom, from whose precise location the spatial phase of the scattering interference pattern must be measured, is technically difficult. Here we introduce a generalization of this approach for use with multiple impurity atoms, and demonstrate its validity by comparing the Δ$\frac{α}{k}$ it generates to the Δ$\frac{α}{k}$ determined from single-atom scattering in FeSe where s± energy-gap symmetry is established. ... mehr

Verlagsausgabe §
DOI: 10.5445/IR/1000129338
Veröffentlicht am 05.02.2021
DOI: 10.1038/s41535-020-00303-4
Zitationen: 2
Web of Science
Zitationen: 1
Zitationen: 2
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Quantenmaterialien und -technologien (IQMT)
Publikationstyp Zeitschriftenaufsatz
Publikationsjahr 2021
Sprache Englisch
Identifikator ISSN: 2397-4648
KITopen-ID: 1000129338
HGF-Programm 47.11.02 (POF IV, LK 01) Emergent Quantum Phenomena
Erschienen in npj quantum materials
Verlag Nature Research
Band 6
Heft 1
Seiten Art.-Nr.: 7
Vorab online veröffentlicht am 11.01.2021
Nachgewiesen in Web of Science
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