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Related Concept Videos

The Electrical Double Layer01:30

The Electrical Double Layer

In the region where two bulk phases meet, an intricate electric charge distribution arises due to charge transfer, ion adsorption, molecular orientation, and charge distortion. This complex distribution is commonly referred to as the electrical double layer.When a solid electrode interfaces with ions in an electrolyte solution, the speed of electron transfer dictates the rates of oxidation and reduction. The electrode acquires a charge through the escape of atoms into the solution as cations or...
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...
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Lattice energy represents the energy released when gaseous cations and anions combine to form an ionic solid, reflecting the strength of electrostatic interactions within the crystal. This process is fundamentally governed by Coulombic attraction between oppositely charged ions, where the potential energy varies inversely with the interionic distance and directly with the product of ionic charges. As ions approach one another, the electrostatic energy becomes increasingly negative, indicating a...
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Electrostatic Boundary Conditions in Dielectrics

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Imperfections in Crystal Structure: Non-Stoichiometric Defects01:29

Imperfections in Crystal Structure: Non-Stoichiometric Defects

Non-stoichiometric defects refer to a type of defect in the crystal structure of a compound where the ratio of its constituent elements deviates from the ideal stoichiometric ratio. There are two main types of non-stoichiometric defects: metal excess defects and metal deficiency defects.Metal excess defects occur when there is a slight surplus of metal ions than what is required by the stoichiometric ratio of the compound. For example, heating a sodium chloride crystal in sodium vapor results...
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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: May 11, 2026

Growth and Electrostatic/chemical Properties of Metal/LaAlO3/SrTiO3 Heterostructures
11:54

Growth and Electrostatic/chemical Properties of Metal/LaAlO3/SrTiO3 Heterostructures

Published on: February 8, 2018

Anisotropic two-dimensional electron gas at the LaAlO₃/SrTiO₃ (110) interface.

A Annadi1, Q Zhang, X Renshaw Wang

  • 1NUSNNI-Nanocore, National University of Singapore, Singapore 117411, Singapore.

Nature Communications
|May 16, 2013
PubMed
Summary

Unexpected conductivity was found at the LaAlO₃/SrTiO₃ interface on (110)-oriented SrTiO₃. This electronic reconstruction occurs even without expected polarization discontinuity, opening new avenues for oxide electronics.

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Area of Science:

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

Background:

  • High-mobility two-dimensional electron gas (2DEG) at complex oxide interfaces, like LaAlO₃/SrTiO₃, shows promise for oxide electronics.
  • Conductivity in these systems is typically attributed to polarization discontinuity and electronic reconstruction.
  • Crystal orientation is considered crucial, with no conductivity expected at (110)-oriented SrTiO₃ interfaces.

Purpose of the Study:

  • To investigate the unexpected conductivity at the LaAlO₃/SrTiO₃ interface on (110)-oriented SrTiO₃.
  • To understand the mechanism driving conductivity in this seemingly non-polar orientation.
  • To explore the anisotropic properties and potential applications of this conductive interface.

Main Methods:

  • Fabrication of LaAlO₃/SrTiO₃ heterostructures on (110)-oriented SrTiO₃ substrates.
  • Electrical transport measurements, including thickness-dependent metal-insulator transitions.
  • Density Functional Theory (DFT) calculations to model interface structure and electronic properties.

Main Results:

  • Observation of unexpected conductivity at the LaAlO₃/(110) SrTiO₃ interface.
  • A thickness-dependent metal-insulator transition was observed.
  • DFT calculations revealed that a buckled TiO₂/LaO interface structure maintains polarization discontinuity, enabling electronic reconstruction and conductivity.
  • The conductivity was found to be strongly anisotropic.

Conclusions:

  • Electronic reconstruction and conductivity can occur at the LaAlO₃/(110) SrTiO₃ interface due to specific interface reconstructions.
  • The anisotropic conductivity suggests potential for novel anisotropic superconductivity and magnetism.
  • This finding expands the possibilities for designing functional oxide electronic devices.