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Related Concept Videos

Trends in Lattice Energy: Ion Size and Charge02:54

Trends in Lattice Energy: Ion Size and Charge

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:
Ionic Crystal Structures02:42

Ionic Crystal Structures

Ionic crystals consist of two or more different kinds of ions that usually have different sizes. The packing of these ions into a crystal structure is more complex than the packing of metal atoms that are the same size.
Most monatomic ions behave as charged spheres, and their attraction for ions of opposite charge is the same in every direction. Consequently, stable structures for ionic compounds result (1) when ions of one charge are surrounded by as many ions as possible of the opposite...
Colors and Magnetism03:02

Colors and Magnetism

Color in Coordination Complexes
When atoms or molecules absorb light at the proper frequency, their electrons are excited to higher-energy orbitals. For many main group atoms and molecules, the absorbed photons are in the ultraviolet range of the electromagnetic spectrum, which cannot be detected by the human eye. For coordination compounds, the energy difference between the d orbitals often allows photons in the visible range to be absorbed and emitted, which is seen as colors by the human eye.
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.
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Electrical Transport01:29

Electrical Transport

The electrical transport property of a material is defined by its resistance and conductivity. Resistance is the measure of a material's ability to resist the flow of electric current, while conductivity gauges its ability to allow the current to pass through, depending on the geometry of the measurement cell, such as electrode spacing and area. Conductivity is measured in Siemens (S). There are different types of conductance, including specific conductance, equivalent conductance, and molar...
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...

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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

Evidence for One-Dimensional Charge Transport in La(2-x-y)Nd(y)Sr(x)CuO(4).

Noda1, Eisaki, Uchida

  • 1Department of Superconductivity, The University of Tokyo, Tokyo 113-8656, Japan.

Science (New York, N.Y.)
|October 9, 1999
PubMed
Summary

This study reveals a shift in charge transport in neodymium-doped lanthanum strontium cuprate. At low doping levels, transport is one-dimensional, changing to two-dimensional at higher concentrations.

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Radio Frequency Magnetron Sputtering of GdBa2Cu3O7−δ/ La0.67Sr0.33MnO3 Quasi-bilayer Films on SrTiO3 (STO) Single-crystal Substrates
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Tuning Oxide Properties by Oxygen Vacancy Control During Growth and Annealing

Published on: June 9, 2023

Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Solid State Chemistry

Background:

  • Neodymium-doped lanthanum strontium cuprate (La(1.4-x)Nd(0.6)Sr(x)CuO(4)) exhibits complex electronic properties.
  • Understanding charge transport mechanisms is crucial for developing advanced electronic materials.

Purpose of the Study:

  • To investigate the doping dependence of resistivity and Hall coefficient in La(1.4-x)Nd(0.6)Sr(x)CuO(4).
  • To elucidate the nature of charge transport within the static spin-charge stripe ordered phase.

Main Methods:

  • Measurements of resistivity and Hall coefficient as a function of doping concentration (x).
  • Analysis of charge transport behavior in the static spin-charge stripe ordered phase.

Main Results:

  • A rapid decrease in Hall coefficient magnitude at low temperatures (x <= 1/8) indicates one-dimensional charge transport.
  • For higher doping concentrations (x > 1/8), the Hall coefficient remains large in the ordered phase.
  • Evidence for a crossover from one-dimensional to two-dimensional charge transport at x = 1/8.

Conclusions:

  • The doping concentration critically influences the dimensionality of charge transport in this material.
  • A distinct crossover point at x = 1/8 separates one-dimensional and two-dimensional transport regimes.
  • These findings offer insights into the electronic phase diagram of cuprate superconductors.