Search research articles

ABOUT JoVE

Overview Leadership Blog JoVE Help Center

AUTHORS

Publishing Process Editorial Board Scope & Policies Peer Review FAQ Submit

LIBRARIANS

Testimonials Subscriptions Access Resources Library Advisory Board FAQ

RESEARCH

JoVE Journal Methods Collections JoVE Encyclopedia of Experiments Archive

EDUCATION

JoVE Core JoVE Business JoVE Science Education JoVE Lab Manual Faculty Resource Center Faculty Site

Terms & Conditions of Use

Related Concept Videos

Superconductor

Superconductor

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...

Types Of Superconductors

Types Of Superconductors

A superconductor is a substance that offers zero resistance to the electric current when it drops below a critical temperature. Zero resistance is not the only interesting phenomenon as materials reach their transition temperatures. A second effect is the exclusion of magnetic fields. This is known as the Meissner effect. A light, permanent magnet placed over a superconducting sample will levitate in a stable position above the superconductor. High-speed trains that levitate on strong...

Fermi Level

Fermi Level

The Fermi-Dirac function is represented by an S-shaped curve indicating the probability of an energy state being occupied by an electron at a given temperature. The Fermi level is the energy level at which there is a fifty percent chance of finding an electron, and it is positioned between the lower-energy valence band and the higher-energy conduction band.
At absolute zero temperature, electrons fill all energy states up to the Fermi level, leaving upper states empty. As the temperature rises,...

Valence Bond Theory

Valence Bond Theory

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...

Fermi Level Dynamics

Fermi Level Dynamics

The vacuum level denotes the energy threshold required for an electron to escape from a material surface. It is usually positioned above the conduction band of a semiconductor and acts as a benchmark for comparing electron energies within various materials.
Electron affinity in semiconductors refers to the energy gap between the minimum of its conduction band and the vacuum level and it is a critical parameter in determining how easily a semiconductor can accept additional electrons.
The work...

Ferromagnetism

Ferromagnetism

Materials like iron, nickel, and cobalt consist of magnetic domains, within which the magnetic dipoles are arranged parallel to each other. The magnetic dipoles are rigidly aligned in the same direction within a domain by quantum mechanical coupling among the atoms. This coupling is so strong that even thermal agitation at room temperature cannot break it. The result is that each domain has a net dipole moment. However, some materials have weaker coupling, and are ferromagnetic at lower...

You might also read

Related Articles

Articles linked to this work by shared authors, journal, and citation graph.

Sort by

Same author

Thermally Induced Crossover from 2D to 1D Behavior in an Array of Atomic Wires: Silicon Dangling-Bond Solitons in Si(553)-Au.

Physical review letters·2020

Same author

Local Moment Instability of Os in Honeycomb Li<sub>2.15</sub>Os<sub>0.85</sub>O<sub>3</sub>.

Scientific reports·2018

Same author

Single Nodal Loop of Accidental Degeneracies in Minimal Symmetry: Triclinic CaAs_{3}.

Physical review letters·2017

Same author

Spin Chains and Electron Transfer at Stepped Silicon Surfaces.

Nano letters·2016

Same author

Structural transition in atomic chains driven by transient doping.

Physical review letters·2013

Same author

Evidence for long-range spin order instead of a Peierls transition in si(553)-Au chains.

Physical review letters·2013

Search research articles

Related Experiment Video

Updated: Jul 12, 2026

Comparison of Two Different Synthesis Methods of Single Crystals of Superconducting Uranium Ditelluride

Comparison of Two Different Synthesis Methods of Single Crystals of Superconducting Uranium Ditelluride

Published on: July 8, 2021

Theoretical Fermi-Surface Properties and Superconducting Parameters for K3C60.

S C Erwin, W E Pickett

Science (New York, N.Y.)

|November 8, 1991

Summary

This study details the Fermi surface of potassium-doped fullerene (K(3)C(60)), revealing its two-sheet structure. This detailed electronic description is crucial for understanding fulleride superconductivity and strong coupling mechanisms.

Area of Science:

Solid State Physics
Materials Science
Quantum Chemistry

Background:

Quantitative theories of superconductivity in alkali-doped C(60) necessitate precise Fermi surface descriptions.
Potassium-doped C(60) (K(3)C(60)) serves as a key prototype fulleride superconductor.

Purpose of the Study:

To provide first-principles calculations of Fermi-surface properties and electronic parameters for K(3)C(60).
To elucidate the electronic structure relevant for understanding its superconducting behavior.

Main Methods:

First-principles electronic structure calculations.
Analysis of Fermi surface topology and electronic parameters.

Main Results:

The Fermi surface of K(3)C(60) consists of two sheets: a free-electron-like sheet and a multiply-connected sheet with two interlocked, non-touching pieces.

More Related Videos

Scalable Quantum Integrated Circuits on Superconducting Two-Dimensional Electron Gas Platform

Scalable Quantum Integrated Circuits on Superconducting Two-Dimensional Electron Gas Platform

Published on: August 2, 2019

Visualizing Uniaxial-strain Manipulation of Antiferromagnetic Domains in Fe1+YTe Using a Spin-polarized Scanning Tunneling Microscope

Visualizing Uniaxial-strain Manipulation of Antiferromagnetic Domains in Fe₁₊_YTe Using a Spin-polarized Scanning Tunneling Microscope

Published on: March 24, 2019

Related Experiment Videos

Last Updated: Jul 12, 2026

Comparison of Two Different Synthesis Methods of Single Crystals of Superconducting Uranium Ditelluride

Comparison of Two Different Synthesis Methods of Single Crystals of Superconducting Uranium Ditelluride

Published on: July 8, 2021

Scalable Quantum Integrated Circuits on Superconducting Two-Dimensional Electron Gas Platform

Scalable Quantum Integrated Circuits on Superconducting Two-Dimensional Electron Gas Platform

Published on: August 2, 2019

Visualizing Uniaxial-strain Manipulation of Antiferromagnetic Domains in Fe1+YTe Using a Spin-polarized Scanning Tunneling Microscope

Visualizing Uniaxial-strain Manipulation of Antiferromagnetic Domains in Fe₁₊_YTe Using a Spin-polarized Scanning Tunneling Microscope

Published on: March 24, 2019

Calculated London penetration depth (clean limit) is Lambda = 1600 A.

Superconducting pairing strength (lambda) is approximately 5, indicating very strong coupling, derived from Fermi velocity and coherence length comparison.

Conclusions:

The complex Fermi surface structure, particularly partial nesting in the second sheet, may promote coupling with specific optic phonon modes.
The findings support a strong-coupling mechanism in K(3)C(60) superconductivity.