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Related Concept Videos

Ferromagnetism01:31

Ferromagnetism

2.4K
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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Magnetic Susceptibility and Permeability01:31

Magnetic Susceptibility and Permeability

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In linear magnetic materials, like paramagnets and diamagnets, magnetization is proportional to the magnetic field intensity. The constant of proportionality, a dimensionless number, is called magnetic susceptibility. The value of the susceptibility depends on the type of material.
When diamagnetic materials are placed under an external magnetic field, the moments opposite to the field are induced. Hence, the susceptibility for diamagnets has a minimal negative value of 10-5–10-6. Since...
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Paramagnetism01:30

Paramagnetism

2.5K
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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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....
2.4K
Potential Due to a Magnetized Object01:24

Potential Due to a Magnetized Object

263
Magnetic dipoles in magnetic materials are aligned when placed under an external magnetic field. For paramagnets and ferromagnets, dipole alignment occurs in the direction of the magnetic field. However, the dipoles align opposite to the field in the case of diamagnets. This state of magnetic polarization due to the external field is called magnetization. Magnetization is defined as the dipole moment per unit volume. It plays a similar role to polarization in electrostatics.
The vector...
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Linear magnetoresistance from glassy orders.

Jaewon Kim1, Ehud Altman1, Shubhayu Chatterjee2

  • 1Department of Physics, University of California, Berkeley, CA 94720.

Proceedings of the National Academy of Sciences of the United States of America
|October 31, 2024
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Summary
This summary is machine-generated.

Strongly correlated metals exhibit linear magnetoresistance (LMR), defying Fermi liquid theory. This study explains LMR

Keywords:
linear magnetoresistancestrange metalstrongly correlated materials

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Area of Science:

  • Condensed matter physics
  • Quantum materials science

Background:

  • Many correlated metals show B-linear magnetoresistance (LMR), deviating from [Formula: see text] scaling predicted by Fermi liquid theory.
  • This phenomenon is observed across diverse materials, suggesting a universal underlying mechanism.

Purpose of the Study:

  • To provide a unifying explanation for the origin of B-linear magnetoresistance (LMR) in correlated metals.
  • To identify the key material features responsible for the universal LMR slope.

Main Methods:

  • Development of two microscopic models to investigate the relationship between LMR and proximity to symmetry-breaking orders.
  • Analysis of the role of the order parameter's wave-vector and Fermi surface nodes in LMR emergence.

Main Results:

  • Demonstrated that LMR with a universal slope arises ubiquitously near ordered phases under specific conditions.
  • Identified two distinct physical mechanisms driving LMR based on the nature of the order parameter.
  • Derived bounds for the magnetic field range where LMR is observable.

Conclusions:

  • Proximity to symmetry-breaking orders is the unifying explanation for universal LMR in correlated metals.
  • The presence of finite wave-vector order or nodes on the Fermi surface are critical for LMR.
  • The theory offers insights into strange metal physics and explains recent experimental findings in cuprates and moiré materials.