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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...
Fermi Level01:18

Fermi Level

The Fermi-Dirac function is represented by an S-shaped curve indicating the probability of an energy state being occupied by an electron at a given temperature. The Fermi level is the energy level at which there is a fifty percent chance of finding an electron, and it is positioned between the lower-energy valence band and the higher-energy conduction band.
At absolute zero temperature, electrons fill all energy states up to the Fermi level, leaving upper states empty. As the temperature rises,...
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...
Phase Diagrams of Ternary Systems01:28

Phase Diagrams of Ternary Systems

Consider a ternary system, which is composed of three components: water (W), ethanoic acid (E), and trichloromethane (T). Here, Ethanoic acid (E) is fully miscible with both water (W) and trichloromethane (T), meaning it can mix entirely with either of them. However, water and trichloromethane have partial miscibility, meaning they can only mix to a certain extent, beyond which two separate phases will form.The phase diagram of a ternary system is represented as an equilateral triangle, where...
Phase Transitions: Melting and Freezing02:39

Phase Transitions: Melting and Freezing

Heating a crystalline solid increases the average energy of its atoms, molecules, or ions, and the solid gets hotter. At some point, the added energy becomes large enough to partially overcome the forces holding the molecules or ions of the solid in their fixed positions, and the solid begins the process of transitioning to the liquid state or melting. At this point, the temperature of the solid stops rising, despite the continual input of heat, and it remains constant until all of the solid is...

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Related Experiment Video

Updated: May 29, 2026

Visualizing Uniaxial-strain Manipulation of Antiferromagnetic Domains in Fe1+YTe Using a Spin-polarized Scanning Tunneling Microscope
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Phase separation and superconductivity in Fe(1+x)Te(0.5)Se(0.5).

Vikas Bhatia1, Efrain E Rodriguez, Nicholas P Butch

  • 1Department of Materials Science and Engineering, University of Maryland, College Park, MD 20742, USA.

Chemical Communications (Cambridge, England)
|September 20, 2011
PubMed
Summary

Superconductivity in iron-based superconductors like Fe(1+x)Te(0.5)Se(0.5) is governed by anti-PbO layer stacking. Homogeneous structures impede superconductivity, while phase-separated ones enhance it.

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Solid State Chemistry

Background:

  • Fe(1+x)Te(0.5)Se(0.5) serves as a foundational material for understanding iron-based superconductivity.
  • The precise relationship between crystal structure and superconducting properties requires further elucidation.

Purpose of the Study:

  • To investigate the influence of anti-PbO layer stacking on the superconducting state of Fe(1+x)Te(0.5)Se(0.5).
  • To determine the structural characteristics that promote or hinder superconductivity in this material.

Main Methods:

  • Crystallographic analysis to examine the stacking of anti-PbO layers.
  • Microstructural characterization to identify phase separation and ordering.
  • Analysis of lattice parameters and microstrain to correlate with superconducting properties.

Main Results:

  • Superconductivity in Fe(1+x)Te(0.5)Se(0.5) is directly controlled by the stacking arrangement of anti-PbO layers.
  • Homogeneous ordering of these layers suppresses superconductivity.
  • The highest superconducting volume fractions are achieved in phase-separated structures, indicated by variations in lattice parameters and microstrain.

Conclusions:

  • The stacking order of anti-PbO layers is a critical factor in controlling superconductivity in Fe(1+x)Te(0.5)Se(0.5).
  • Phase-separated structures, rather than homogeneous ones, are optimal for achieving high superconducting fractions.