On the Tc enhancement mechanism at the FeSe/SrTiO3 interface
ORAL
Abstract
At the interface between monolayer FeSe films and STO substrate the superconducting transition temperature (Tc) is unexpectedly high. The mechanism for the Tc enhancement has been the central question, as it may present a new strategy for seeking out higher Tc materials.
To reveal the mechanism, by combining advances in high quality interface growth, 16O-18O isotope substitution, and extensive data from angle resolved photoemission spectroscopy, we provide striking evidence that the high Tc in FeSe/STO is the cooperative effect of the intrinsic pairing mechanism in the FeSe and interactions between the FeSe electrons and STO phonons.
Furthermore, our results point to the promising prospect that similar cooperation between different Cooper pairing channels may be a general framework to understand and design HTSCs.
To reveal the mechanism, by combining advances in high quality interface growth, 16O-18O isotope substitution, and extensive data from angle resolved photoemission spectroscopy, we provide striking evidence that the high Tc in FeSe/STO is the cooperative effect of the intrinsic pairing mechanism in the FeSe and interactions between the FeSe electrons and STO phonons.
Furthermore, our results point to the promising prospect that similar cooperation between different Cooper pairing channels may be a general framework to understand and design HTSCs.
*The National Key R&D Program of the MOST of China (Grant Nos. 2016YFA0300200, 2017YFA0303004);
The National Science Foundation of China (Grant Nos. 11704073, 11504342).
Discussions with:
Profs. Dragan Mihailovic, Hugo Keller, Annette Bussmann-Holder, Frederick Walker, and Victor E. Henrich on the isotope effects;
Guangming Zhang, Qianghua Wang, and Steve Johnston on EPI.
Dr. Darren Peets for help with the editing.
Dr. Qiuyun Chen for help with the SIMS measurements.
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Presenters
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Tianlun Yu
- Physics, Fudan University