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Related Concept Videos

Types Of Superconductors01:28

Types Of Superconductors

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A superconductor is a substance that offers zero resistance to the electric current when it drops below a critical temperature. Zero resistance is not the only interesting phenomenon as materials reach their transition temperatures. A second effect is the exclusion of magnetic fields. This is known as the Meissner effect. A light, permanent magnet placed over a superconducting sample will levitate in a stable position above the superconductor. High-speed trains that levitate on strong...
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A substance that reaches superconductivity, a state in which magnetic fields cannot penetrate, and there is no electrical resistance, is referred to as a superconductor. In 1911, Heike Kamerlingh Onnes of Leiden University, a Dutch physicist, observed a relation between the temperature and the resistance of the element mercury. The mercury sample was then cooled in liquid helium to study the linear dependence of resistance on temperature. It was observed that, as the temperature decreased, the...
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The Fermi-Dirac function is represented by an S-shaped curve indicating the probability of an energy state being occupied by an electron at a given temperature. The Fermi level is the energy level at which there is a fifty percent chance of finding an electron, and it is positioned between the lower-energy valence band and the higher-energy conduction band.
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The vacuum level denotes the energy threshold required for an electron to escape from a material surface. It is usually positioned above the conduction band of a semiconductor and acts as a benchmark for comparing electron energies within various materials.
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Unraveling Enhanced Superconductivity in Single-Layer FeSe through Substrate Surface Terminations.

Qiang Zou1, Gi-Yeop Kim2, Jong-Hoon Kang3

  • 1Department of Physics and Astronomy, West Virginia University, Morgantown, West Virginia 26506, United States.

Nano Letters
|September 3, 2025
PubMed
Summary
This summary is machine-generated.

Enhanced superconductivity in single-layer iron selenide (FeSe) films is linked to optimal electron correlations and substrate charge transfer. This study reveals how different surface terminations of strontium titanate (SrTiO3) substrates influence FeSe superconductivity.

Keywords:
FeSeSe−Fe−Se tetrahedral angleSrO-terminated SrTiO3TiO2-terminated SrTiO3electron correlationsscanning tunneling microscopy

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Surface Science

Background:

  • Single-layer iron selenide (FeSe) on strontium titanate (SrTiO3) exhibits significantly higher superconducting transition temperatures than bulk FeSe.
  • Potential factors driving this enhancement include electron doping, interfacial electron-phonon coupling, and electron correlations.

Purpose of the Study:

  • To determine the primary factors responsible for the enhanced superconductivity in single-layer FeSe films grown on different SrTiO3 surface terminations.
  • To investigate the correlation between interfacial structure, charge transfer, electron correlations, and superconducting properties.

Main Methods:

  • Growth of single-layer FeSe films on SrTiO3(001) substrates with both TiO2 and SrO surface terminations.
  • Scanning tunneling spectroscopy (STS) to measure superconducting gaps and work functions.
  • Angle-resolved photoemission spectroscopy (ARPES) to confirm charge transfer.
  • Scanning transmission electron microscopy (STEM) to analyze interfacial atomic structures.
  • Dynamical mean-field theory (DMFT) calculations for theoretical comparison.

Main Results:

  • A larger superconducting gap (17.0 meV) was observed on the TiO2-terminated surface compared to the SrO-terminated surface (10.5 meV).
  • The SrO surface exhibited a larger work function, leading to reduced charge transfer to FeSe.
  • Distinct interfacial atomic structures were identified, with variations in the Se-Fe-Se tetrahedral angle between terminations.
  • DMFT calculations suggest optimal electron correlations contribute to enhanced superconductivity on the TiO2 termination.

Conclusions:

  • Enhanced superconductivity in single-layer FeSe on TiO2-terminated SrTiO3 arises from a combination of optimal electron correlations and sufficient charge transfer from the substrate.
  • Interfacial atomic structure and substrate termination play crucial roles in modulating the electronic properties and superconductivity of FeSe films.