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Related Concept Videos

Imperfections in Crystal Structure: Stoichiometric Point Defects01:26

Imperfections in Crystal Structure: Stoichiometric Point Defects

Schottky defects arise when some lattice points in a crystal, such as those in NaCl, remain unoccupied, creating lattice vacancies without disturbing the overall electrical neutrality of the crystal. This defect is common in ionic crystals where the positive and negative ions are similar in size, as seen in sodium chloride and cesium chloride. The presence of Schottky defects enables the crystal to conduct electricity to a small extent through an ionic mechanism. Electric fields cause nearby...
Electrostatic Boundary Conditions in Dielectrics01:27

Electrostatic Boundary Conditions in Dielectrics

When an electric field passes from one homogeneous medium to another, crossing the boundary between the two mediums imparts a discontinuity in the electric field. This results in electrostatic boundary conditions that depend on the type of mediums the field propagates through.
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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...
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.
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Band Theory02:35

Band Theory

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There is variation in the electrical conductivity of materials - metals, semiconductors, and insulators that are showcased with the help of the energy band diagrams.
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High Resolution Phonon-assisted Quasi-resonance Fluorescence Spectroscopy
10:40

High Resolution Phonon-assisted Quasi-resonance Fluorescence Spectroscopy

Published on: June 28, 2016

Electron-phonon decoupling in disordered insulators.

M Ovadia1, B Sacépé, D Shahar

  • 1Department of Condensed Matter Physics, Weizmann Institute of Science, Rehovot 76100, Israel.

Physical Review Letters
|June 13, 2009
PubMed
Summary
This summary is machine-generated.

In disordered superconductors, sharp current jumps in the insulating state reveal electron overheating. Electrons become thermally decoupled from the lattice, indicating a key transition mechanism.

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Using Microwave and Macroscopic Samples of Dielectric Solids to Study the Photonic Properties of Disordered Photonic Bandgap Materials
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High Resolution Phonon-assisted Quasi-resonance Fluorescence Spectroscopy
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Using Microwave and Macroscopic Samples of Dielectric Solids to Study the Photonic Properties of Disordered Photonic Bandgap Materials
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Using Microwave and Macroscopic Samples of Dielectric Solids to Study the Photonic Properties of Disordered Photonic Bandgap Materials

Published on: September 26, 2014

Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Superconductivity

Background:

  • Disordered superconductors exhibit a transition from superconducting to insulating states under specific conditions.
  • The insulating state is characterized by sharp changes in current-voltage (I-V) characteristics, indicating threshold voltages.
  • Understanding this transition is crucial for fundamental physics and potential applications.

Purpose of the Study:

  • To analyze the current-voltage characteristics in the field-tuned insulating state of amorphous indium oxide films.
  • To investigate the underlying mechanisms responsible for the abrupt current changes observed.
  • To determine the thermal coupling between electrons and the lattice in the insulating phase.

Main Methods:

  • Measurement of current-voltage characteristics in amorphous indium oxide films.
  • Analysis of threshold voltages and abrupt current changes.
  • Modeling electron temperature bistability and electron-phonon decoupling.

Main Results:

  • Observed sharp threshold voltages in the I-V curves, with current changes up to 5 orders of magnitude.
  • Demonstrated consistency with bistability of electron temperature.
  • Showed significant electron system overheating above the lattice temperature.

Conclusions:

  • The observed current jumps in the insulating state are attributed to electron temperature bistability.
  • Electrons are significantly overheated and thermally decoupled from the phonon bath in this insulating regime.
  • This thermal decoupling is a key feature of the insulating state in disordered superconductors.