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Related Concept Videos

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...
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...
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...
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.
Electron Configuration of Multielectron Atoms03:26

Electron Configuration of Multielectron Atoms

The alkali metal sodium (atomic number 11) has one more electron than the neon atom. This electron must go into the lowest-energy subshell available, the 3s orbital, giving a 1s22s22p63s1 configuration. The electrons occupying the outermost shell orbital(s) (highest value of n) are called valence electrons, and those occupying the inner shell orbitals are called core electrons. Since the core electron shells correspond to noble gas electron configurations, we can abbreviate electron...

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Related Experiment Video

Updated: May 10, 2026

Comparison of Two Different Synthesis Methods of Single Crystals of Superconducting Uranium Ditelluride
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Published on: July 8, 2021

Reentrant superconductivity in Eu(Fe(1-x)Ir(x))2As2.

U B Paramanik1, Debarchan Das, R Prasad

  • 1Department of Physics, Indian Institute of Technology, Kanpur 208016, India.

Journal of Physics. Condensed Matter : an Institute of Physics Journal
|June 12, 2013
PubMed
Summary

Superconductivity and magnetic ordering coexist in Eu(Fe1-xIrx)2As2. A superconducting transition was observed, followed by resistivity reentrance due to magnetic ordering of europium (Eu) moments.

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Angle-resolved Photoemission Spectroscopy At Ultra-low Temperatures
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Angle-resolved Photoemission Spectroscopy At Ultra-low Temperatures
08:53

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Published on: October 9, 2012

Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Solid-State Chemistry

Background:

  • Investigating the coexistence and interplay of superconductivity and magnetism in novel materials is crucial for understanding fundamental physical phenomena.
  • Europium (Eu)-based compounds offer a unique platform to study these interactions due to the presence of localized magnetic moments.

Purpose of the Study:

  • To elucidate the relationship between superconductivity and europium (Eu(2+)) magnetic ordering in the Eu(Fe1-xIrx)2As2 material system.
  • To understand the impact of iridium (Ir) doping on the electronic structure and superconducting properties of EuFe2As2.

Main Methods:

  • Electrical transport measurements to identify superconducting transitions and resistivity anomalies.
  • Magnetic measurements, specifically low-field magnetization, to probe superconducting diamagnetism and magnetic ordering.
  • Electronic structure calculations (implied by investigation) to analyze density of states, bandwidth, and hybridization.

Main Results:

  • Observed a superconducting transition below 22.6 K in Eu(Fe0.86Ir0.14)2As2, followed by a resistivity reentrance linked to Eu(2+) magnetic ordering.
  • Demonstrated a significant diamagnetic signal from superconductivity despite the presence of a strong magnetic order in Eu(Fe0.86Ir0.14)2As2.
  • Electronic structure analysis revealed lower density of states, broader bandwidth, and enhanced Ir hybridization in the doped compound (EuFe1.75Ir0.25As2) compared to the parent EuFe2As2, indicating electron doping.

Conclusions:

  • The study confirms the intricate interplay between superconductivity and Eu(2+) magnetic ordering in Eu(Fe1-xIrx)2As2.
  • Iridium doping effectively modifies the electronic structure, leading to electron doping and influencing the superconducting and magnetic properties.
  • The observed coexistence highlights the potential for designing materials with competing electronic orders.