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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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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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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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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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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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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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Philosophical Transactions. Series A, Mathematical, Physical, and Engineering Sciences
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Summary

Molecular superconductors like A3C60 exhibit a phase diagram similar to cuprates, with superconductivity arising from a Mott-insulating state. Critical temperature is maximized at the crossover between Jahn-Teller and Fermi liquid metals.

Keywords:
Jahn–Teller effectMott insulatorantiferromagnetismelectron correlationfullerenessuperconductivity

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Area of Science:

  • Solid State Physics
  • Materials Science
  • Superconductivity

Background:

  • A3C60 molecular superconductors share electronic phase diagrams with unconventional high-temperature superconductors, such as cuprates.
  • Superconductivity emerges from an antiferromagnetic Mott-insulating state by tuning parameters like pressure, showing a dome-shaped critical temperature dependence.
  • Unlike atom-based superconductors, the parent state in A3C60 is governed by the C60 molecule's electronic structure and the Jahn-Teller effect.

Purpose of the Study:

  • To elucidate the electronic phase diagram of A3C60 molecular superconductors.
  • To understand the role of the Jahn-Teller effect and molecular structure in superconductivity.
  • To investigate the transition from unconventional to conventional metallic behavior and its impact on superconductivity.

Main Methods:

  • Analysis of the electronic phase diagram of A3C60.
  • Investigation of the Jahn-Teller effect's influence on molecular geometry and spin state.
  • Study of the transition from Mott-insulating to Jahn-Teller metal and Fermi liquid states.

Main Results:

  • Superconductivity in A3C60 emerges from a Mott-Jahn-Teller insulating state, similar to cuprates.
  • Tuning parameters leads to a Jahn-Teller metal with coexisting quasi-localized and itinerant electrons.
  • Localized features diminish with lattice contraction, leading to conventional Fermi liquid behavior.
  • The highest critical temperature is observed at the crossover between Jahn-Teller and Fermi liquid behavior as the Jahn-Teller distortion melts.

Conclusions:

  • A3C60 molecular superconductors provide a model system for understanding unconventional superconductivity.
  • The interplay between molecular electronic structure, Jahn-Teller effect, and lattice properties governs the superconducting phase diagram.
  • The study highlights the importance of the metal-to-metal transition in optimizing superconducting properties.