Related Experiment Video
Updated: Jul 25, 2026
12:20
Sputter Growth and Characterization of Metamagnetic B2-ordered FeRh Epilayers
Published on: October 5, 2013
Pseudogap formation in the intermetallic compounds (Fe1-xVx)3Al
1Department of Physics and Graduate School of Science and Technology, Kobe University, Kobe 657-8501, Japan.
Physical Review Letters
|October 6, 2000
Summary
The study reveals that increasing vanadium in (Fe1-xVx)3Al compounds reduces states near the Fermi energy. Fe2VAl exhibits an unusual pseudogap, explaining its unique electronic properties.
Area of Science:
- Condensed Matter Physics
- Materials Science
Background:
- Intermetallic compounds often exhibit complex electronic behaviors.
- Understanding the electronic structure of materials like (Fe1-xVx)3Al is crucial for developing new technologies.
Purpose of the Study:
- To investigate the effect of vanadium substitution on the electronic properties of Fe3Al.
- To elucidate the origin of the observed electronic behavior in Fe2VAl.
Main Methods:
- Optical conductivity measurements were performed on (Fe1-xVx)3Al compounds.
- Analysis of the density of states around the Fermi energy (E(F)).
Main Results:
- Increasing vanadium content (x) in (Fe1-xVx)3Al significantly reduces the density of states at E(F).
- Fe2VAl (x=0.33) displays a pronounced pseudogap (0.1-0.2 eV) at E(F) with a low carrier density.
- The pseudogap is attributed to the material's band structure, not correlation effects.
Conclusions:
- The band structure of Fe2VAl is responsible for its deep pseudogap.
- A model is proposed to explain the semiconductor-like transport and metallic photoemission in Fe2VAl.
More Related Videos
08:55Methods of Ex Situ and In Situ Investigations of Structural Transformations: The Case of Crystallization of Metallic Glasses
Published on: June 7, 2018
09:49In Situ Transmission Electron Microscopy with Biasing and Fabrication of Asymmetric Crossbars Based on Mixed-Phased a-VOx
Published on: May 13, 2020
Related Concept Videos
02:32Bonding in Metals
Metallic bonds are formed between two metal atoms. A simplified model to describe metallic bonding has been developed by Paul Drüde called the “Electron Sea Model”.
02:37Metallic Solids
Metallic solids such as crystals of copper, aluminum, and iron are formed by metal atoms. The structure of metallic crystals is often described as a uniform distribution of atomic nuclei within a “sea” of delocalized electrons. The atoms within such a metallic solid are held together by a unique force known as metallic bonding that gives rise to many useful and varied bulk properties.
All metallic solids exhibit high thermal and electrical conductivity, metallic luster, and malleability. Many...
All metallic solids exhibit high thermal and electrical conductivity, metallic luster, and malleability. Many...
02:42Valence 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...
03:02Colors 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.
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.
01:31Ferromagnetism
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...
01:29Imperfections in Crystal Structure: Non-Stoichiometric Defects
Non-stoichiometric defects refer to a type of defect in the crystal structure of a compound where the ratio of its constituent elements deviates from the ideal stoichiometric ratio. There are two main types of non-stoichiometric defects: metal excess defects and metal deficiency defects.Metal excess defects occur when there is a slight surplus of metal ions than what is required by the stoichiometric ratio of the compound. For example, heating a sodium chloride crystal in sodium vapor results...