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Related Concept Videos

Valence Bond Theory02:42

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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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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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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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Spin–Spin Coupling: One-Bond Coupling01:17

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Coupling interactions are strongest between NMR-active nuclei bonded to each other, where spin information can be transmitted directly through the pair of bonding electrons. While nuclei polarize their electrons to the opposite spins, the bonding electron pair has opposite spins. Configurations with antiparallel nuclear spins are expected to be lower in energy. When coupling makes antiparallel states more favorable, J is considered to have a positive value. The one-bond coupling constant, 1J,...
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Two NMR-active nuclei bonded to a central atom can be involved in geminal or two-bond coupling. Geminal coupling is commonly seen between diastereotopic protons in chiral molecules and unsymmetrical alkenes, among others.
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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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Superconductivity in strong spin orbital coupling compound Sb₂Se₃.

P P Kong1, F Sun2, L Y Xing1

  • 1Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China.

Scientific Reports
|October 21, 2014
PubMed
Summary
This summary is machine-generated.

High pressure induces superconductivity in antimony selenide (Sb2Se3) single crystals. This pressure-induced topological quantum transition also leads to an insulator-to-metal state, with superconductivity observed above 10 GPa.

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Quantum Materials

Background:

  • A2B3 compounds like Bi2Te3 and Bi2Se3 are known topological insulators.
  • Antimony selenide (Sb2Se3) was previously considered topologically trivial.
  • Theoretical studies suggested pressure could induce topological nontriviality in Sb2Se3.

Purpose of the Study:

  • To investigate the effect of high pressure on Sb2Se3.
  • To discover superconductivity in Sb2Se3 single crystals.
  • To explore the relationship between pressure-induced topological transitions and superconductivity.

Main Methods:

  • Single crystal growth of Sb2Se3.
  • High-pressure experiments utilizing diamond anvil cells.
  • Electrical transport measurements to detect insulator-to-metal transitions and superconductivity.
  • High-pressure Raman spectroscopy to probe structural and electronic changes.

Main Results:

  • Superconductivity discovered in Sb2Se3 at pressures above 10 GPa.
  • An insulator-to-metal transition observed around 3 GPa, linked to topological quantum transition.
  • Superconducting transition temperature (TC) reached 8.0 K at 40 GPa.
  • Structural and electronic changes confirmed by Raman spectroscopy, correlating with superconductivity onset and TC behavior.

Conclusions:

  • High pressure can induce superconductivity in the topologically trivial compound Sb2Se3.
  • The pressure-induced insulator-to-metal transition is associated with a topological quantum phase transition.
  • Sb2Se3 exhibits pressure-tunable superconductivity without structural phase transitions up to 40 GPa.