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Related Concept Videos

Ferromagnetism01:31

Ferromagnetism

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...
Valence Bond Theory02:42

Valence Bond Theory

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...
Magnetic Field due to Moving Charges01:23

Magnetic Field due to Moving Charges

A stationary charge creates and interacts with the electric field, while a moving charge creates a magnetic field.
Consider a point charge moving with a constant velocity. Like the electric field, the magnetic field at any point is directly proportional to the magnitude of the charge and inversely proportional to the square of the distance between the source point and the field point. However, unlike the electric field, the magnetic field is always perpendicular to the plane containing the line...
Magnetic Fields01:27

Magnetic Fields

A moving charge or a current creates a magnetic field in the surrounding space, in addition to its electric field. The magnetic field exerts a force on any other moving charge or current that is present in the field. Like an electric field, the magnetic field is also a vector field. At any position, the direction of the magnetic field is defined as the direction in which the north pole of a compass needle points.
A magnetic field is defined by the force that a charged particle experiences...
Paramagnetism01:30

Paramagnetism

Paramagnets are materials with unpaired electrons that possess a finite magnetic moment. In the absence of a magnetic field, these moments are randomly oriented, and thus the net moment is zero. Under an external field, a torque acting on the moments tends to align them along the field's direction. However, the random thermal motion of electrons produces a torque opposite to the external field and tries to disorient the moments. These two competing effects align only a few moments along the...
Diamagnetism01:26

Diamagnetism

Materials consisting of paired electrons have zero net magnetic moments. However, when these materials are placed under an external magnetic field, the moments opposite to the field are induced. Such materials are called diamagnets. Diamagnetism is the response of the diamagnets when placed in an external magnetic field.
Diamagnetism was discovered by Anton Brugmans in 1778 when he observed that bismuth gets repelled by magnetic fields, thus theorizing that diamagnets get repelled by magnets.

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Related Experiment Video

Updated: May 8, 2026

Visualizing Uniaxial-strain Manipulation of Antiferromagnetic Domains in Fe1+YTe Using a Spin-polarized Scanning Tunneling Microscope
09:06

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Published on: March 24, 2019

Strong correlation induced charge localization in antiferromagnets.

Zheng Zhu1, Hong-Chen Jiang, Yang Qi

  • 1Institute for Advanced Study, Tsinghua University, Beijing, 100084, China.

Scientific Reports
|September 5, 2013
PubMed
Summary

A new study shows that holes injected into antiferromagnets do not behave as expected. Instead, they self-localize due to strong correlations, challenging the quasiparticle picture in doped Mott insulators.

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Published on: March 24, 2019

Magnetometric Characterization of Intermediates in the Solid-State Electrochemistry of Redox-Active Metal-Organic Frameworks
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Area of Science:

  • Strongly correlated physics
  • Condensed matter physics
  • Quantum materials

Background:

  • The behavior of holes in antiferromagnets is crucial for understanding doped Mott insulators.
  • This is closely related to the mechanism of high-temperature superconductivity.

Purpose of the Study:

  • To investigate the motion of a single hole injected into an antiferromagnetic t-J ladder system.
  • To challenge the conventional quasiparticle picture in such systems.

Main Methods:

  • Systematic numerical study using the density matrix renormalization group (DMRG).
  • Analysis of the dynamics of a single hole in an undoped t-J ladder.

Main Results:

  • The study reveals the self-localization of the doped hole, invalidating the quasiparticle picture.
  • This charge localization is a novel phenomenon driven purely by strong electron correlations, not disorder.
  • Destructive quantum interference of novel signs acquired by the hole causes this localization.

Conclusions:

  • The findings introduce a new paradigm for understanding doped Mott insulators.
  • This phenomenon is a generic feature of doped Mott physics and may extend beyond single-hole systems.
  • Challenges existing models and opens new avenues for research in correlated electron systems.