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Related Concept Videos

Crystal Field Theory - Octahedral Complexes02:58

Crystal Field Theory - Octahedral Complexes

Crystal Field Theory
To explain the observed behavior of transition metal complexes (such as colors), a model involving electrostatic interactions between the electrons from the ligands and the electrons in the unhybridized d orbitals of the central metal atom has been developed. This electrostatic model is crystal field theory (CFT). It helps to understand, interpret, and predict the colors, magnetic behavior, and some structures of coordination compounds of transition metals.
CFT focuses on...
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Consider a conductor in electrostatic equilibrium. The net electric field inside a conductor vanishes, and extra charges on the conductor reside on its outer surface, regardless of where they originate.
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A stationary charge creates and interacts with the electric field, while a moving charge creates a magnetic field.
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Trends in Lattice Energy: Ion Size and Charge02:54

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An ionic compound is stable because of the electrostatic attraction between its positive and negative ions. The lattice energy of a compound is a measure of the strength of this attraction. The lattice energy (ΔHlattice) of an ionic compound is defined as the energy required to separate one mole of the solid into its component gaseous ions. For the ionic solid sodium chloride, the lattice energy is the enthalpy change of the process:

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Related Experiment Video

Updated: Jun 14, 2026

Tuning Oxide Properties by Oxygen Vacancy Control During Growth and Annealing
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Published on: June 9, 2023

Dominant mobility modulation by the electric field effect at the LaAlO3/SrTiO3 interface.

C Bell1, S Harashima, Y Kozuka

  • 1Department of Advanced Materials Science, University of Tokyo, Kashiwa, Chiba 277-8651, Japan.

Physical Review Letters
|April 7, 2010
PubMed
Summary

Researchers investigated the gate-modulated superconducting LaAlO3/SrTiO3 interface. They found electric fields primarily affect electron mobility, not carrier density, influencing superconductivity and disorder strength across the transition.

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Last Updated: Jun 14, 2026

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Radio Frequency Magnetron Sputtering of GdBa2Cu3O7−δ/ La0.67Sr0.33MnO3 Quasi-bilayer Films on SrTiO3 (STO) Single-crystal Substrates
06:49

Radio Frequency Magnetron Sputtering of GdBa2Cu3O7−δ/ La0.67Sr0.33MnO3 Quasi-bilayer Films on SrTiO3 (STO) Single-crystal Substrates

Published on: April 12, 2019

Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Quantum Phenomena

Background:

  • The LaAlO3/SrTiO3 interface exhibits tunable superconductivity via electric fields.
  • Understanding the dominant mechanism of electric field modulation is crucial for controlling interfacial properties.

Purpose of the Study:

  • To elucidate the primary effect of applied electric fields on the superconducting LaAlO3/SrTiO3 interface.
  • To investigate the relationship between carrier density, mobility, and superconductivity under electric field modulation.

Main Methods:

  • Magnetotransport studies were performed on a gated LaAlO3/SrTiO3 heterostructure.
  • Measurements analyzed the variations in sheet carrier density and electron mobility with applied gate bias.

Main Results:

  • Electron mobility variations were found to be approximately five times larger than sheet carrier density variations.
  • Superconductivity was suppressed at both positive and negative gate biases.
  • These findings suggest a significant increase in relative disorder strength near the superconductor-insulator transition.

Conclusions:

  • The electric field's principal effect on the LaAlO3/SrTiO3 interface is the modulation of electron mobility.
  • The observed suppression of superconductivity and increased disorder highlight the complex interplay between electric fields, mobility, and quantum phase transitions.