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Related Concept Videos

Types Of Superconductors01:28

Types Of Superconductors

1.8K
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...
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Superconductor01:24

Superconductor

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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...
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Phase Transitions02:31

Phase Transitions

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Whether solid, liquid, or gas, a substance's state depends on the order and arrangement of its particles (atoms, molecules, or ions). Particles in the solid pack closely together, generally in a pattern. The particles vibrate about their fixed positions but do not move or squeeze past their neighbors. In liquids, although the particles are closely spaced, they are randomly arranged. The position of the particles are not fixed—that is, they are free to move past their neighbors to...
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Phase Transitions01:21

Phase Transitions

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A phase transition is the process in which a substance changes from one state of matter to another, like from a solid to a liquid, liquid to gas, or vice versa, at a specific temperature and under given pressure conditions. This change is spontaneous and is affected by alterations in temperature and pressure. These parameters impact the strength of the forces between molecules (intermolecular forces) in the substance.During a phase transition, both the initial and final phases of the substance...
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Phase Transitions: Melting and Freezing02:39

Phase Transitions: Melting and Freezing

15.6K
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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Phase Transitions: Sublimation and Deposition02:33

Phase Transitions: Sublimation and Deposition

20.7K
Some solids can transition directly into the gaseous state, bypassing the liquid state, via a process known as sublimation. At room temperature and standard pressure, a piece of dry ice (solid CO2) sublimes, appearing to gradually disappear without ever forming any liquid. Snow and ice sublimate at temperatures below the melting point of water, a slow process that may be accelerated by winds and the reduced atmospheric pressures at high altitudes. When solid iodine is warmed, the solid sublimes...
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Two distinct superconducting phases in LiFeAs.

P K Nag1, R Schlegel1, D Baumann1

  • 1IFW Dresden, Institute for Solid State Research, 01171 Dresden, Germany.

Scientific Reports
|June 15, 2016
PubMed
Summary
This summary is machine-generated.

Superconductivity in LiFeAs exhibits two distinct phases, with a partial gap opening at 18K and full superconductivity emerging at 16K. This temperature evolution reveals key insights into multiband superconductor behavior.

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Area of Science:

  • Condensed Matter Physics
  • Materials Science

Background:

  • Multiband superconductors, like iron-pnictides, are theoretically expected to show complex temperature-dependent superconducting behaviors.
  • These behaviors can include phase transitions and the emergence of time-reversal symmetry breaking order parameters.

Purpose of the Study:

  • To investigate the temperature evolution of superconductivity in LiFeAs using scanning tunnelling spectroscopy.
  • To identify and characterize distinct superconducting phases and their associated electronic signatures.

Main Methods:

  • Scanning tunnelling spectroscopy (STS) was employed to probe the electronic properties of LiFeAs.
  • Analysis focused on characteristic features in the tunnelling spectra, such as coherence peaks and dip-hump structures.

Main Results:

  • Two distinct superconducting phases were identified in LiFeAs.
  • A partial superconducting gap was observed at 18K, indicated by subtle spectral features.
  • At 16K, these features intensified, signifying full superconductivity.
  • The consistent separation between dip-hump structures and coherence peaks ruled out antiferromagnetic spin resonance as the cause.

Conclusions:

  • LiFeAs displays a non-trivial temperature evolution of its superconducting state.
  • The observed spectral changes provide evidence for two distinct superconducting phases.
  • The findings contribute to understanding the complex nature of superconductivity in multiband materials.