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Related Concept Videos

Ferromagnetism01:31

Ferromagnetism

2.5K
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...
2.5K
Types Of Superconductors01:28

Types Of Superconductors

1.1K
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...
1.1K
Superconductor01:24

Superconductor

1.2K
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...
1.2K

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Lithium intercalated FeSe as a high-temperature superconducting ferromagnet.

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Researchers achieved superconductivity and ferromagnetism in FeSe at high temperatures using electric-field controlled lithiation. This breakthrough enables new possibilities for spintronics and dissipationless electronics.

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Area of Science:

  • Condensed Matter Physics
  • Materials Science

Background:

  • Merging superconductivity and ferromagnetism is challenging due to their antagonistic nature.
  • Achieving these properties in a single material could unlock novel quantum phenomena for advanced devices.

Purpose of the Study:

  • To merge superconductivity and ferromagnetism in FeSe at record-high temperatures.
  • To explore the interplay between these two phenomena and their potential applications.

Main Methods:

  • Electric-field controlled lithiation of FeSe.
  • In-situ gating to switch between nonmagnetic and ferromagnetic superconducting states.
  • Magneto-transport measurements and scanning superconducting quantum interference device (sSQUID) microscopy.
  • Density-functional theory (DFT) calculations.

Main Results:

  • Superconductivity and ferromagnetism were merged in FeSe at high temperatures (up to 200 K).
  • FeSe was switched between a nonmagnetic superconductor and a superconducting ferromagnet via electric-field control.
  • Itinerant ferromagnetism persisted below the superconducting transition temperature (45 K).
  • In-plane magnetic fields were found to enhance superconductivity, indicating a strong interplay.

Conclusions:

  • Electric-field controlled lithiation is a viable method to merge superconductivity and ferromagnetism in FeSe.
  • The findings open new avenues for iron-based superconductors in spintronics and dissipationless electronics.
  • The intimate interplay between superconductivity and ferromagnetism at high temperatures is demonstrated.