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Related Concept Videos

Ferromagnetism01:31

Ferromagnetism

3.0K
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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Phase Transitions: Melting and Freezing02:39

Phase Transitions: Melting and Freezing

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Heating a crystalline solid increases the average energy of its atoms, molecules, or ions, and the solid gets hotter. At some point, the added energy becomes large enough to partially overcome the forces holding the molecules or ions of the solid in their fixed positions, and the solid begins the process of transitioning to the liquid state or melting. At this point, the temperature of the solid stops rising, despite the continual input of heat, and it remains constant until all of the solid is...
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Paramagnetism01:30

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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...
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Phase Transitions02:31

Phase Transitions

22.5K
Whether solid, liquid, or gas, a substance's state depends on the order and arrangement of its particles (atoms, molecules, or ions). Particles in the solid pack closely together, generally in a pattern. The particles vibrate about their fixed positions but do not move or squeeze past their neighbors. In liquids, although the particles are closely spaced, they are randomly arranged. The position of the particles are not fixed—that is, they are free to move past their neighbors to...
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States of Matter and Phase Changes00:59

States of Matter and Phase Changes

4.5K
The internal energy of a substance—the total kinetic energy of all its molecules and the potential energy of their associated forces—depends on the strength of the intermolecular forces in the condensed phases and the pressure exerted on the substance. The internal energy of a substance is the highest in the gaseous state, the lowest in the solid state, and intermediate in the liquid state. Phase transitions are caused by changes in physical conditions, such as temperature and...
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Diamagnetism01:26

Diamagnetism

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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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High-Temperature Phase Separation and Charge-Magnon Liquid in Kinetic Antiferromagnets.

Johan Carlström1,2

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Kinetic antiferromagnetism drives phase separation in quantum materials. This study reveals charge-magnon bound states forming a liquid, crucial for high-temperature quantum ordering.

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Area of Science:

  • Condensed matter physics
  • Quantum materials science

Background:

  • Understanding quantum ordering in strongly correlated systems is key for developing new quantum materials.
  • Kinetic antiferromagnetism in triangular lattices presents a unique system for study.

Purpose of the Study:

  • Investigate kinetic antiferromagnetism under an applied magnetic field.
  • Explore the emergence and behavior of spin polarons as charge-magnon bound states.

Main Methods:

  • Large-scale diagrammatic Monte Carlo simulations.
  • Spectral function analysis to determine energy corrections.

Main Results:

  • Spin polarons exhibit mutual attraction, driving phase separation into charge- and magnon-rich regions.
  • Mott insulating voids border these regions.
  • Magnon interactions cause significant energy corrections, forming a bound charge-magnon liquid.

Conclusions:

  • Kinetic magnetism offers a pathway for strong intercarrier attraction and high-temperature quantum ordering.
  • Findings are relevant to MoTe_{2}/WSe_{2} moiré bilayers and quantum material design.