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Related Concept Videos

Band Theory02:35

Band Theory

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When two or more atoms come together to form a molecule, their atomic orbitals combine and molecular orbitals of distinct energies result. In a solid, there are a large number of atoms, and therefore a large number of atomic orbitals that may be combined into molecular orbitals. These groups of molecular orbitals are so closely placed together to form continuous regions of energies, known as the bands.
The energy difference between these bands is known as the band gap.
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Isolated atoms have discrete energy levels that are well described by the Bohr model. And, it quantifies the energy of an electron in a hydrogen atom as En. Higher quantum numbers 'n' yield less negative, closer electron energy levels.
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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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Theory of Metallic Conduction01:17

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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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Alkali Metals03:06

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Group 1 elements are soft and shiny metallic solids. They are malleable, ductile, and good conductors of heat and electricity. The melting points of the alkali metals are unusually low for metals and decrease going down the group, while the density increases going down the group with the exception of potassium (Table 1).
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Superconductor01:24

Superconductor

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A substance that reaches superconductivity, a state in which magnetic fields cannot penetrate, and there is no electrical resistance, is referred to as a superconductor. In 1911, Heike Kamerlingh Onnes of Leiden University, a Dutch physicist, observed a relation between the temperature and the resistance of the element mercury. The mercury sample was then cooled in liquid helium to study the linear dependence of resistance on temperature. It was observed that, as the temperature decreased, the...
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Probe Type II Band Alignment in One-Dimensional Van Der Waals Heterostructures Using First-Principles Calculations
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Evidence for Band Renormalizations in Strong-Coupling Superconducting Alkali-Fulleride Films.

J S Zhou1,2, R Z Xu1,2, X Q Yu1,2

  • 1State Key Laboratory of Low Dimensional Quantum Physics, Department of Physics, Tsinghua University, Beijing 100084, China.

Physical Review Letters
|June 9, 2023
PubMed
Summary

Investigating superconducting potassium-3C60 (K3C60), this study reveals strong electron-phonon coupling and a large superconducting gap, suggesting a strong-coupling mechanism. Electronic correlations also play a role in this unusual fulleride superconductor.

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Quantum Mechanics

Background:

  • Alkali-intercalated fullerides exhibit unusual superconductivity, with the underlying mechanism remaining a subject of debate.
  • Understanding the electronic structure is key to elucidating the properties of these materials.

Purpose of the Study:

  • To systematically investigate the electronic structures of superconducting potassium-3C60 (K3C60) thin films.
  • To provide insights into the mechanism of superconductivity in fulleride compounds.

Main Methods:

  • High-resolution angle-resolved photoemission spectroscopy (ARPES).
  • Analysis of band structure, quasiparticle kinks, and replica bands.

Main Results:

  • Observed a dispersive energy band with a bandwidth of approximately 130 meV.
  • Identified prominent quasiparticle kinks and replica bands linked to Jahn-Teller active phonon modes, indicating strong electron-phonon coupling (estimated constant ~1.2).
  • Measured an isotropic, nodeless superconducting gap (2Δ/kBTc ≈ 5), exceeding mean-field predictions, and observed signatures of electronic correlation effects.

Conclusions:

  • The findings support a strong-coupling superconductivity model for K3C60, driven by significant electron-phonon interactions.
  • Electronic correlation effects are also present, contributing to the complex electronic behavior.
  • The study provides direct visualization of the band structure, crucial for understanding fulleride superconductivity.