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Related Concept Videos

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.
Magnetic Susceptibility and Permeability01:31

Magnetic Susceptibility and Permeability

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...
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...
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...
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...
Magnetic Moment of an Electron01:23

Magnetic Moment of an Electron

Electrons revolving around a nucleus are analogous to a circular current carrying loop. This current produces a magnetic dipole moment proportional to the electron's orbital angular momentum. Since the orbital angular momentum is quantized in terms of the reduced Planck's constant, the dipole moment is quantized in the Bohr Magneton. The value of the Bohr magneton is 9.27 x 10-24 Am2. Electrons also have an intrinsic spin angular momentum, and the associated spin magnetic moment is...

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Advanced Experimental Methods for Low-temperature Magnetotransport Measurement of Novel Materials
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Linear Magnetoresistance in a Strange Metal.

Jaewon Kim1,2, Shubhayu Chatterjee3

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

Physical Review Letters
|May 22, 2026
PubMed
Summary

Strange metallic transport, characterized by T-linear resistivity, is explained by proximity to quantum critical points. Our model reveals how this proximity drives anomalous electron scattering, matching experimental findings.

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Area of Science:

  • Condensed Matter Physics
  • Quantum Materials
  • Electronic Phases

Background:

  • Strongly correlated electronic phases exhibit anomalous transport properties, such as strange metallic behavior.
  • Conventional metals display quadratic scaling in resistivity and magnetoresistance, contrasting with strange metals' linear scaling.

Purpose of the Study:

  • To explain the origins of strange metallic transport anomalies (T-linear resistivity and B-linear magnetoresistance).
  • To develop a minimal microscopic model that captures these transport phenomena near quantum critical points.

Main Methods:

  • Coupling electronic excitations at the Fermi surface to quantum critical bosons.
  • Incorporating spatially disordered Yukawa interactions and static density wave order.
  • Solving the minimal microscopic model to derive transport properties.

Main Results:

  • The transport relaxation rate exhibits T-linear scaling at low magnetic fields and B-linear scaling at low temperatures.
  • The model reproduces the observed T-linear resistivity and B-linear magnetoresistance characteristic of strange metals.
  • Magnetoresistance shows a scaling collapse when magnetic field and resistance are rescaled by temperature, aligning with experimental data.

Conclusions:

  • Proximity to quantum critical points is a viable explanation for strange metallic transport anomalies.
  • The developed microscopic model successfully captures the essential physics of these anomalous transport behaviors.
  • The findings provide a theoretical framework for understanding diverse strange metal candidates.