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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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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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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 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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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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Consider a conductor in electrostatic equilibrium. The net electric field inside a conductor vanishes, and extra charges on the conductor reside on its outer surface, regardless of where they originate.
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Related Experiment Video

Updated: Jun 4, 2025

Growth and Electrostatic/chemical Properties of Metal/LaAlO3/SrTiO3 Heterostructures
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A Two-Dimensional Superconducting Electron Gas at LaFeO3/SrTiO3 Interfaces.

Zhangwen Mao1,2, Dawei Qiu3, Zhihang Xu4

  • 1National Laboratory of Solid State Microstructures, Jiangsu Key Laboratory of Artificial Functional Materials, College of Engineering and Applied Sciences, Nanjing University, Nanjing 210023, P. R. China.

Nano Letters
|December 17, 2024
PubMed
Summary

Superconductivity was discovered in a two-dimensional electron gas (2DEG) at LaFeO3/SrTiO3 interfaces, exhibiting tunable properties and a Berezinskii-Kosterlitz-Thouless transition, offering a new platform for quantum research.

Keywords:
ferromagnetismmolecular beam epitaxyoxide interfacesuperconductivitytwo-dimensional electron gas

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Quantum Phenomena

Background:

  • Transition metal oxide interfaces display unique properties not found in bulk materials.
  • The coexistence of superconductivity and magnetism in these interfaces is a key research area.

Purpose of the Study:

  • To report the discovery of superconductivity in the 2DEG at LaFeO3/SrTiO3 interfaces.
  • To characterize the nature and tunability of this emergent superconductivity.

Main Methods:

  • Fabrication of LaFeO3/SrTiO3 heterostructures.
  • Electrical transport measurements, including resistance and magnetoresistance.
  • Low-temperature characterization to observe superconducting transitions and Berezinskii-Kosterlitz-Thouless behavior.

Main Results:

  • Superconductivity observed in the 2DEG at LaFeO3/SrTiO3 interfaces with a transition temperature (Tc) of 333 mK and layer thickness of 13.7 nm.
  • Evidence for two-dimensional superconductivity confirmed by Berezinskii-Kosterlitz-Thouless transition.
  • Gate voltage (Vg) dependence of Tc shows a dome-shaped behavior, indicating tunability.
  • Hysteretic magnetoresistance observed in the superconducting regime.

Conclusions:

  • LaFeO3/SrTiO3 interfaces host a tunable, two-dimensional superconducting state.
  • This system provides a novel platform for exploring quantum phenomena at oxide interfaces.
  • Further investigation is needed to understand the mechanism behind the observed hysteretic magnetoresistance.