Absence of superconductivity in ultrathin layers of FeSe synthesized on a topological insulator
Andreas Eich, Nils Rollfing, Fabian Arnold, Charlotte Sanders, Pascal R. Ewen, Marco Bianchi, Maciej Dendzik, Matteo Michiardi, Jian-Li Mi, Martin Bremholm, Daniel Wegner, Philip Hofmann, Alexander A. Khajetoorians
DOI 10.1103/PhysRevB.94.125437 · Physical Review B
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Abstract
The structural and electronic properties of FeSe ultrathin layers on Bi2Se3 have been investigated with a combination of scanning tunneling microscopy and spectroscopy and angle-resolved photoemission spectroscopy. The FeSe multilayers, which are predominantly 3–5 monolayers (MLs) thick, exhibit a hole pocket-like electron band at Γ¯ and a dumbbell-like feature at M¯, similar to multilayers of FeSe on SrTiO3. Moreover, the topological state of the Bi2Se3 is preserved beneath the FeSe layer, as indicated by a heavily n-doped Dirac cone. Low temperature scanning tunneling spectroscopy does not exhibit a superconducting gap for any investigated thickness down to a temperature of 5 K.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| FeSe Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
| FeSe Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
| FeSe Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 8 | Pressure unresolved | unknown |
| FeSe Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 100 | Pressure not reported | unknown |
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