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Related Concept Videos

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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Types Of Superconductors01:28

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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...
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Atomic Nuclei: Nuclear Spin State Population Distribution01:14

Atomic Nuclei: Nuclear Spin State Population Distribution

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Near absolute zero temperatures, in the presence of a magnetic field, the majority of nuclei prefer the lower energy spin-up state to the higher energy spin-down state. As temperatures increase, the energy from thermal collisions distributes the spins more equally between the two states. The Boltzmann distribution equation gives the ratio of the number of spins predicted in the spin −½ (N−) and spin +½ (N+) states.
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Valence Bond Theory02:42

Valence Bond Theory

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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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Valence Bond Theory02:45

Valence Bond Theory

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Overview of Valence Bond Theory
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Ferromagnetism01:31

Ferromagnetism

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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...
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High-Temperature Superconductivity from Finite-Range Attractive Interaction.

Dmitry Miserev1, Joel Hutchinson1, Herbert Schoeller2

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Physical Review Letters
|November 17, 2025
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Summary
This summary is machine-generated.

A finite-range attractive interaction in Fermi liquids does not create a superconducting gap, challenging BCS theory. Adding short-range attraction stabilizes superconductivity, showing quantum critical behavior relevant to high-temperature superconductors.

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Area of Science:

  • Condensed Matter Physics
  • Quantum Materials
  • Superconductivity Theory

Background:

  • Conventional BCS theory describes superconductivity via attractive contact interactions.
  • Long-range attractive interactions are not fully explored within BCS framework.
  • Understanding deviations from BCS is crucial for novel superconducting materials.

Purpose of the Study:

  • To investigate the impact of finite-range attractive interactions on Fermi liquids.
  • To explore the conditions for superconductivity beyond standard BCS theory.
  • To analyze the resulting phenomena, such as quantum criticality and critical temperature dependence.

Main Methods:

  • Theoretical analysis of D-dimensional interacting Fermi liquids.
  • Examination of pair susceptibility under finite-range interactions.
  • Modeling superconductivity in layered quasi-two-dimensional materials with phonon-mediated interactions.

Main Results:

  • Finite-range attractive interactions (R_s >> λ_F) do not induce a superconducting gap, contrary to BCS predictions.
  • Pair susceptibility exhibits a power-law singularity, indicating quantum critical behavior without long-range order.
  • Superconductivity is stabilized by introducing a short-range attractive interaction.
  • A dome-shaped critical temperature (Tc) versus doping is observed, with a suppressed isotope effect and weak dependence on interaction range.

Conclusions:

  • The study reveals limitations of BCS theory for finite-range interactions.
  • Quantum criticality without long-range order is a key feature of these systems.
  • The findings offer insights into mechanisms relevant to high-temperature superconductors.