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Related Concept Videos

Fermi Level Dynamics01:12

Fermi Level Dynamics

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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.
Electron affinity in semiconductors refers to the energy gap between the minimum of its conduction band and the vacuum level and it is a critical parameter in determining how easily a semiconductor can accept additional electrons.
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Fermi Level01:18

Fermi Level

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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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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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Band Theory02:35

Band Theory

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When two or more atoms come together to form a molecule, their atomic orbitals combine and molecular orbitals of distinct energies result. In a solid, there are a large number of atoms, and therefore a large number of atomic orbitals that may be combined into molecular orbitals. These groups of molecular orbitals are so closely placed together to form continuous regions of energies, known as the bands.
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Theory of Metallic Conduction01:17

Theory of Metallic Conduction

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The conduction of free electrons inside a conductor is best described by quantum mechanics. However, a classical model makes predictions close to the results of quantum mechanics. It is called the theory of metallic conduction.
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Superconductor01:24

Superconductor

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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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Visualizing Uniaxial-strain Manipulation of Antiferromagnetic Domains in Fe1+YTe Using a Spin-polarized Scanning Tunneling Microscope
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Tuning the band structure and superconductivity in single-layer FeSe by interface engineering.

R Peng1, H C Xu1, S Y Tan1

  • 11] State Key Laboratory of Surface Physics, Department of Physics, Fudan University, Shanghai 200433, China [2] Advanced Materials Laboratory, Fudan University, Shanghai 200433, China.

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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.

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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.