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Related Concept Videos

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...
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...
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...
Theory of Metallic Conduction01:17

Theory of Metallic Conduction

The conduction of free electrons inside a conductor is best described by quantum mechanics. However, a classical model makes predictions close to the results of quantum mechanics. It is called the theory of metallic conduction.
In this theory, Newton's second law of motion is used to determine the acceleration of an electron in the presence of an applied electric field. Then, its velocity is expressed via this acceleration.
An electron moves through the crystal, containing positive ions,...
Types of Semiconductors01:20

Types of Semiconductors

Intrinsic semiconductors are highly pure materials with no impurities. At absolute zero, these semiconductors behave as perfect insulators because all the valence electrons are bound, and the conduction band is empty, disallowing electrical conduction. The Fermi level is a concept used to describe the probability of occupancy of energy levels by electrons at thermal equilibrium. In intrinsic semiconductors, the Fermi level is positioned at the midpoint of the energy gap at absolute zero. When...
P-N junction01:11

P-N junction

A p-n junction is formed when p-type and n-type semiconductor materials are joined together. At the interface of the p-n junction, holes from the p-side and electrons from the n-side begin to diffuse into the opposite sides due to the concentration gradient. This diffusion of carriers leads to a region around the junction where there are no free charge carriers, known as the depletion region. The charge density within the depletion region for the n-side and p-side can be described by the...

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Visualizing Uniaxial-strain Manipulation of Antiferromagnetic Domains in Fe1+YTe Using a Spin-polarized Scanning Tunneling Microscope
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A new pnictide superconductor without iron.

Jian-Tao Han1, Jian-Shi Zhou, Jin-Guang Cheng

  • 1Texas Materials Institute, ETC 9.102, University of Texas at Austin, Austin, Texas 78712, USA.

Journal of the American Chemical Society
|October 1, 2009
PubMed
Summary
This summary is machine-generated.

Two new compounds, lithium copper phosphide (LiCu2P2) and lithium iron phosphide (LiFeP), were synthesized and found to exhibit superconductivity. LiCu2P2 superconducts at 3.5 K, while LiFeP superconducts at 4.1 K.

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Area of Science:

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

Background:

  • Superconductivity in novel materials is crucial for technological advancements.
  • Phosphide compounds are an emerging class of superconductors.
  • Understanding structure-property relationships is key to discovering new superconducting materials.

Purpose of the Study:

  • To synthesize and characterize new lithium-containing phosphide compounds.
  • To investigate the crystal structures and superconducting properties of LiCu2P2 and LiFeP.
  • To explore potential structure-superconductivity correlations in these novel materials.

Main Methods:

  • Solid-state reaction for synthesis of LiCu2P2 and LiFeP.
  • X-ray diffraction for crystal structure determination.
  • Resistivity and magnetization measurements to identify superconductivity.

Main Results:

  • LiCu2P2 was synthesized with a crystal structure analogous to BaFe2As2.
  • LiFeP was synthesized with a crystal structure similar to LiFeAs.
  • Superconductivity was observed in LiCu2P2 at 3.5 K and in LiFeP at 4.1 K.

Conclusions:

  • The successful synthesis of LiCu2P2 and LiFeP demonstrates the viability of phosphides as hosts for superconductivity.
  • The observed superconducting transition temperatures provide baseline data for future research on related compounds.
  • Structural similarities to known superconductors suggest potential for tuning properties through chemical modification.