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Related Concept Videos

Trends in Lattice Energy: Ion Size and Charge02:54

Trends in Lattice Energy: Ion Size and Charge

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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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Crystal Field Theory - Octahedral Complexes02:58

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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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Debye–Huckel–Onsager Conductance Equation01:28

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The Debye-Hückel-Onsager equation is a cornerstone of physical chemistry, providing a method to determine the molar conductance (Λm) and molar conductance at infinite dilution (Λ°m) for uni-univalent electrolytes.Uni-univalent electrolytes are electrolytes that dissociate in solution to produce one cation with a +1 charge and one anion with a –1 charge per formula unit.This equation addresses two crucial phenomena: the asymmetry effect and the electrophoretic effect.
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Valence Bond Theory02:42

Valence Bond Theory

11.5K
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...
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Colors and Magnetism03:02

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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...
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Imperfections in Crystal Structure: Stoichiometric Point Defects01:26

Imperfections in Crystal Structure: Stoichiometric Point Defects

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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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All-electronic Nanosecond-resolved Scanning Tunneling Microscopy: Facilitating the Investigation of Single Dopant Charge Dynamics
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Doping-dependent charge order correlations in electron-doped cuprates.

Eduardo H da Silva Neto1, Biqiong Yu2, Matteo Minola3

  • 1Department of Physics and Astronomy, University of British Columbia, Vancouver, British Columbia V6T 1Z1, Canada.; Quantum Matter Institute, University of British Columbia, Vancouver, British Columbia V6T 1Z4, Canada.; Max Planck Institute for Solid State Research, Heisenbergstrasse 1, D-70569 Stuttgart, Germany.; Quantum Materials Program, Canadian Institute for Advanced Research, Toronto, Ontario M5G 1Z8, Canada.

Science Advances
|August 19, 2016
PubMed
Summary

Charge order (CO) in electron-doped cuprates is not universally linked to antiferromagnetism or the pseudogap. Its presence and behavior depend on material-specific factors, influencing its competition with superconductivity.

Keywords:
High-temperature superconductivityantiferromagnetismcharge density wavescupratespseudogapresonant x-ray scattering

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Angle-resolved Photoemission Spectroscopy At Ultra-low Temperatures
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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Quantum Materials

Background:

  • Understanding charge order (CO) is crucial for high-temperature cuprate superconductors.
  • Similar CO forms in hole- and electron-doped cuprates prompt investigation into universal CO phenomena.
  • The relationship between CO and other key phenomena (pseudogap, antiferromagnetism, superconductivity) remains a central question.

Purpose of the Study:

  • To investigate charge order (CO) correlations in electron-doped cuprates (La2-x Cex CuO4 and Nd2-x Cex CuO4).
  • To determine the relationship between CO and antiferromagnetism, pseudogap, and superconductivity in these materials.
  • To ascertain the universality of CO phenomenology across different cuprate types.

Main Methods:

  • Resonant x-ray scattering was employed to measure CO correlations.
  • Detailed measurements were conducted on Nd2-x Cex CuO4 across various doping levels (x = 0.059 to 0.166).
  • CO behavior was examined relative to superconducting transition temperature and in the presence of a magnetic field.

Main Results:

  • Charge order (CO) was confirmed in electron-doped Nd2-x Cex CuO4 within a specific doping range.
  • The CO wave vector correlates with Fermi surface segments and a phonon anomaly near optimal doping.
  • CO onset temperature is highest between x = 0.106 and 0.166, decreasing at lower doping, and is insensitive to superconductivity.

Conclusions:

  • Charge order (CO) in electron-doped cuprates is not intrinsically tied to antiferromagnetism or the pseudogap.
  • Material-dependent factors dictate the strength and prevalence of CO correlations.
  • The ability of CO to compete for the ground state in cuprates is influenced by these material-specific details.