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Related Concept Videos

Superconductor01:24

Superconductor

2.1K
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...
2.1K
Types Of Superconductors01:28

Types Of Superconductors

1.8K
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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Field Effect Transistor01:29

Field Effect Transistor

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Field-effect transistors (FETs) are integral to electronic circuits and distinguished by their three-terminal setup: the gate, drain, and source. These transistors operate as unipolar devices, which utilize either electrons or holes as charge carriers, in contrast to bipolar transistors, which use both types of carriers. The primary function of the FET is to modulate the flow of these carriers from the source to the drain through a channel. The voltage difference between the gate and source...
1.7K
Valence Bond Theory02:42

Valence Bond Theory

11.7K
Coordination compounds and complexes exhibit different colors, geometries, and magnetic behavior, depending on the metal atom/ion and ligands from which they are composed. In an attempt to explain the bonding and structure of coordination complexes, Linus Pauling proposed the valence bond theory, or VBT, using the concepts of hybridization and the overlapping of the atomic orbitals. According to VBT, the central metal atom or ion (Lewis acid) hybridizes to provide empty orbitals of suitable...
11.7K
Biasing of FET01:22

Biasing of FET

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Biasing a Junction Field Effect Transistor (JFET) is crucial for setting operational parameters and ensuring efficient functioning in electronic circuits. JFETs are characterized by using a single carrier type in N-channel or P-channel configurations, where the channel is surrounded by PN junctions. These junctions are central to the device's ability to control current flow.
In an N-channel JFET, the structure consists of N-type material forming the channel on a P-type substrate, with the...
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Ferromagnetism01:31

Ferromagnetism

3.5K
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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Comparison of Two Different Synthesis Methods of Single Crystals of Superconducting Uranium Ditelluride
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Stoichiometric FeTe is a superconductor.

Zi-Jie Yan1, Zihao Wang1, Bing Xia1

  • 1Department of Physics, The Pennsylvania State University, University Park, PA, USA.

Nature
|April 1, 2026
PubMed
Summary
This summary is machine-generated.

Stoichiometric iron telluride (FeTe) films exhibit superconductivity up to 13.5 K after removing interstitial iron atoms. This finding overturns the view of FeTe as an antiferromagnetic metal, revealing its inherent superconducting nature.

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Area of Science:

  • Condensed Matter Physics
  • Materials Science

Background:

  • Iron-based superconductors (FeSCs) feature competing electronic bands and antiferromagnetic (AFM) correlations, leading to diverse ground states like superconductivity and nematicity.
  • Iron telluride (FeTe) was previously considered an antiferromagnetic metal, contrasting with its superconducting analog FeSe.

Purpose of the Study:

  • To investigate the role of stoichiometry in the electronic properties of FeTe.
  • To determine if FeTe can exhibit superconductivity.

Main Methods:

  • Epitaxial growth of FeTe films using molecular-beam epitaxy (MBE).
  • Post-growth annealing under tellurium (Te) flux.
  • Spin-polarized scanning tunnelling microscopy and spectroscopy (SP-STM/S) to analyze magnetic order and electronic states.

Main Results:

  • As-grown FeTe films exhibit AFM order due to interstitial Fe atoms disrupting stoichiometry.
  • Te annealing removes interstitial Fe, yielding stoichiometric FeTe films.
  • Stoichiometric FeTe films display robust superconductivity with a critical temperature (Tc) of approximately 13.5 K, confirmed by zero resistance, Meissner effect, and Cooper-pair tunneling.

Conclusions:

  • Stoichiometric FeTe is inherently a superconductor, not an antiferromagnetic metal.
  • Interstitial Fe atoms are responsible for the observed AFM order in non-stoichiometric FeTe.
  • Controlling stoichiometry is crucial for understanding and harnessing superconductivity in FeTe-based materials and heterostructures.