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Tuning the band structure and superconductivity in single-layer FeSe by interface engineering
11] State Key Laboratory of Surface Physics, Department of Physics, Fudan University, Shanghai 200433, China [2] Advanced Materials Laboratory, Fudan University, Shanghai 200433, China.
Nature Communications
|September 27, 2014
Summary
Researchers explored how interfaces impact superconductivity in iron selenide films. They found interfacial effects tune electronic correlations and achieve a record 75 K superconducting transition temperature in FeSe, offering insights for new superconducting devices.
Area of Science:
- Condensed Matter Physics
- Materials Science
- Surface Science
Background:
- The interface between transition metal compounds is crucial for emergent phenomena.
- Enhanced superconductivity in single-layer FeSe on Nb-doped SrTiO3 has been observed, but the interfacial effects remain unclear.
Purpose of the Study:
- To investigate how interfacial effects tune superconductivity in FeSe-based heterostructures.
- To understand the origin of enhanced superconducting properties at the FeSe/oxide interface.
Main Methods:
- In situ angle-resolved photoemission spectroscopy (ARPES).
- Molecular beam epitaxy (MBE) for growing FeSe-based heterostructures.
Main Results:
- Superconducting gap-closing temperature (Tg) is tuned by interfacial electronic correlations.
- A record Tg of 75 K was achieved for single-layer FeSe on Nb-doped BaTiO3 with tensile strain.
- Superconductivity is not directly correlated with tensile strain or interfacial phonon modes.
Conclusions:
- The FeSe/oxide interface plays a critical, non-trivial role in achieving high superconducting transition temperatures.
- These findings offer new insights into the mechanism of superconductivity in FeSe and pave the way for cost-effective superconducting devices.
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