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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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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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Pressure-induced superconducting CS2H10 with an H3S framework.

Mingyang Du1, Zihan Zhang1, Tian Cui1,2

  • 1College of Physics, Jilin University, Changchun 130012, People's Republic of China. duandf@jlu.edu.cn.

Physical Chemistry Chemical Physics : PCCP
|October 5, 2021
PubMed
Summary
This summary is machine-generated.

Researchers explored carbon-sulfur-hydrogen compounds for high-temperature superconductors. They identified phases of CS2H10, with one showing dynamic stability at 50 GPa and another exhibiting superconductivity at 155 K.

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Superconductivity

Background:

  • High-temperature superconductivity remains a significant goal in materials science.
  • Previous research highlighted hydrogen-rich compounds as promising candidates for superconductors.

Purpose of the Study:

  • To investigate high-pressure phases of carbon-sulfur-hydrogen compounds.
  • To understand the impact of methane (CH4) insertion on the stability and superconducting properties of H3S sublattices.

Main Methods:

  • High-pressure phase diagram exploration using computational methods.
  • Analysis of crystal structures and superconducting critical temperatures (Tc).

Main Results:

  • Identified four distinct phases of CS2H10: Cmc21, P3m1, P3̄m1, and Pm.
  • P3m1 phase shows dynamic stability at 50 GPa.
  • Cmc21 phase exhibits a high critical temperature (Tc) of 155 K at 150 GPa.
  • Host-guest hydrides (Cmc21 and P3m1) incorporate CH4 into H3S sublattices, reducing stability pressure but impacting Tc.

Conclusions:

  • Methane insertion into H3S lattices lowers the pressure for stability but negatively affects superconductivity.
  • This study provides insights for designing hydrides with high Tc and reduced stability pressures.