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Related Concept Videos

Ferromagnetism01:31

Ferromagnetism

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Materials like iron, nickel, and cobalt consist of magnetic domains, within which the magnetic dipoles are arranged parallel to each other. The magnetic dipoles are rigidly aligned in the same direction within a domain by quantum mechanical coupling among the atoms. This coupling is so strong that even thermal agitation at room temperature cannot break it. The result is that each domain has a net dipole moment. However, some materials have weaker coupling, and are ferromagnetic at lower...
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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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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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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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Atomic Spectroscopy: Effects of Temperature01:27

Atomic Spectroscopy: Effects of Temperature

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Atomization, converting samples into gas-phase atoms and ions, is essential for atomic spectroscopy. The flame temperature required for atomization affects the efficiency of the atomic spectroscopic methods by increasing the atomization efficiency and the relative population of the excited and ground states.
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Related Experiment Video

Updated: Oct 17, 2025

Visualizing Uniaxial-strain Manipulation of Antiferromagnetic Domains in Fe1+YTe Using a Spin-polarized Scanning Tunneling Microscope
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High temperature superconductivity at FeSe/LaFeO3 interface.

Yuanhe Song1, Zheng Chen2, Qinghua Zhang3

  • 1Laboratory of Advanced Materials, State Key Laboratory of Surface Physics, and Department of Physics, Fudan University, 200438, Shanghai, China.

Nature Communications
|October 12, 2021
PubMed
Summary
This summary is machine-generated.

Researchers discovered a new FeSe/LaFeO3 interface exhibiting superconductivity near 80 K, the highest recorded for interfacial superconductors. This finding reveals a cooperative pairing mechanism and suggests a route for designing higher-temperature superconducting materials.

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Superconductivity

Background:

  • High superconducting pairing temperatures (Tg) in FeSe/SrTiO3 (65 K) have spurred interest in interfacial engineering.
  • The unique high Tg of FeSe/TiOx interfaces has limited understanding of general mechanisms and improvement strategies.
  • Discovering new high-Tg interfaces is crucial for advancing the field of superconductivity.

Purpose of the Study:

  • To construct and investigate a novel high-Tg interface using single-layer FeSe and FeOx-terminated LaFeO3.
  • To understand the underlying mechanism responsible for superconductivity in this new interface.
  • To explore pathways for further enhancing superconducting pairing temperatures.

Main Methods:

  • Fabrication of single-layer FeSe interfaced with FeOx-terminated LaFeO3.
  • Experimental characterization using techniques to measure superconducting gap and diamagnetic response.
  • Spectroscopic and theoretical analyses to probe interfacial charge transfer and electron-phonon coupling (EPC).

Main Results:

  • Evidence of superconducting pairing emerging near 80 K in the FeSe/LaFeO3 interface, the highest Tg among known interfacial superconductors.
  • Observation of significant interfacial charge transfer and strong interfacial electron-phonon coupling (EPC).
  • Demonstration that the cooperative pairing mechanism is not limited to FeSe-TiOx systems.

Conclusions:

  • The FeSe/LaFeO3 interface exhibits a record high superconducting pairing temperature, driven by interfacial charge transfer and strong EPC.
  • Stronger interfacial EPC in FeSe/LaFeO3 compared to FeSe/SrTiO3, likely due to enhanced interfacial bonding, explains the higher Tg.
  • This work provides a viable strategy for designing new interfaces to achieve even higher superconducting transition temperatures.