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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...
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...
Types Of Superconductors01:28

Types Of Superconductors

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...
Superconductor01:24

Superconductor

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...
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 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...

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Related Experiment Video

Updated: May 26, 2026

Visualizing Uniaxial-strain Manipulation of Antiferromagnetic Domains in Fe1+YTe Using a Spin-polarized Scanning Tunneling Microscope
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Unconventional temperature enhanced magnetism in Fe1.1Te.

Igor A Zaliznyak1, Zhijun Xu, John M Tranquada

  • 1CMPMSD, Brookhaven National Laboratory, Upton, New York 11973, USA. zaliznyak@bnl.gov

Physical Review Letters
|December 21, 2011
PubMed
Summary

Spin excitations in iron telluride show surprising changes with temperature. Magnetic fluctuations increase upon heating, suggesting complex magnetic behaviors relevant to superconductivity in related materials.

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Area of Science:

  • Condensed matter physics
  • Materials science
  • Magnetism

Background:

  • Superconductivity in iron telluride (FeTe) and related materials (FeTe(1-x)Se(x)) is linked to complex magnetic properties.
  • Understanding the behavior of spin excitations is crucial for explaining the emergence of superconductivity.

Purpose of the Study:

  • To investigate the spin excitations and magnetic properties of iron telluride using inelastic neutron scattering.
  • To explore the thermal evolution of collective magnetism and its relation to superconductivity.

Main Methods:

  • Inelastic neutron scattering (INS) was employed to probe spin excitations.
  • Analysis of magnetic fluctuations across a temperature range relevant to superconductivity.

Main Results:

  • Observed a remarkable thermal evolution of collective magnetism in iron telluride.
  • Noted an unusual, marked increase in magnetic fluctuations upon heating.
  • Effective spin per Fe atom increased from S ≈ 1 (antiferromagnetic phase) to S ≈ 3/2 (disordered phase).

Conclusions:

  • The findings suggest liquidlike correlations of emergent spin plaquettes and Kondo-type behavior in iron telluride.
  • The observed magnetic fluctuations and spin evolution are critical for understanding superconductivity in FeTe(1-x)Se(x) materials.