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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...
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.
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...
Molecular and Ionic Solids02:54

Molecular and Ionic Solids

Crystalline solids are divided into four types: molecular, ionic, metallic, and covalent network based on the type of constituent units and their interparticle interactions.
Molecular Solids
Molecular crystalline solids, such as ice, sucrose (table sugar), and iodine, are solids that are composed of neutral molecules as their constituent units. These molecules are held together by weak intermolecular forces such as London dispersion forces, dipole-dipole interactions, or hydrogen bonds, which...
Colors and Magnetism03:02

Colors and Magnetism

Color in Coordination Complexes
When atoms or molecules absorb light at the proper frequency, their electrons are excited to higher-energy orbitals. For many main group atoms and molecules, the absorbed photons are in the ultraviolet range of the electromagnetic spectrum, which cannot be detected by the human eye. For coordination compounds, the energy difference between the d orbitals often allows photons in the visible range to be absorbed and emitted, which is seen as colors by the human eye.
Metal-Semiconductor Junctions01:24

Metal-Semiconductor Junctions

The contact of metal and semiconductor can lead to the formation of a junction with either Schottky or Ohmic behavior.
Schottky Barriers
Schottky barriers arise when a metal with a work function (Φm) contacts a semiconductor with a different work function (Φs). Initially, electrons transfer until the Fermi levels of the metal and semiconductor align at equilibrium. For instance, if Φm > Φs, the semiconductor Fermi level is higher than the metal's before contact. The semiconductor's...

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Magnetometric Characterization of Intermediates in the Solid-State Electrochemistry of Redox-Active Metal-Organic Frameworks
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GdI2: a new ferromagnetic excitonic solid?

A Taraphder1, M S Laad, L Craco

  • 1Department of Physics & Centre for Theoretical Studies, Indian Institute of Technology, Kharagpur 721302, India. arghya@phy.iitkgp.ernet.in

Physical Review Letters
|October 15, 2008
PubMed
Summary

The colossal magnetoresistive material GdI2 transitions from a metallic to an insulating state. Researchers propose it may be a ferromagnetic excitonic liquid, forming a charge-ordered state at low temperatures.

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Area of Science:

  • Condensed matter physics
  • Materials science

Background:

  • Colossal magnetoresistive (CMR) materials exhibit significant changes in electrical resistance under magnetic fields.
  • Two-dimensional (2D) systems offer unique electronic properties due to quantum confinement.

Purpose of the Study:

  • Investigate the electronic phase transitions in the 2D CMR system Gadolinium diiodide (GdI2).
  • Explore the possibility of GdI2 hosting a ferromagnetic excitonic liquid state.
  • Characterize the low-temperature ground state and its underlying mechanisms.

Main Methods:

  • Analysis of the electronic structure and phase transitions in GdI2.
  • Theoretical modeling of geometrically frustrated, correlated electron systems.
  • Investigation of symmetry breaking and order-by-disorder mechanisms.

Main Results:

  • GdI2 exhibits an unusual metallic state below its ferromagnetic transition.
  • The system becomes insulating at lower temperatures.
  • A charge-ordered, excitonic solid ground state is proposed, driven by order-by-disorder.

Conclusions:

  • GdI2 is a potential candidate for a ferromagnetic excitonic liquid.
  • The observed transitions are linked to orbital correlations and Fermi surface renormalization.
  • Experimental avenues are proposed to verify the proposed excitonic solid ground state.