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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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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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Color in Coordination Complexes
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Crystalline solids are divided into four types: molecular, ionic, metallic, and covalent network based on the type of constituent units and their interparticle interactions.
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Comparison of Two Different Synthesis Methods of Single Crystals of Superconducting Uranium Ditelluride
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Superconductivity in Ce-based cage compounds.

Suman Raj Panday1, Maxim Dzero1

  • 1Department of Physics, Kent State University, Kent, OH 44242, United States of America.

Journal of Physics. Condensed Matter : an Institute of Physics Journal
|April 28, 2023
PubMed
Summary
This summary is machine-generated.

Nodal superconductivity, driven by valence fluctuations, is the ground state in cerium compounds CeNi2Cd20 and CePd2Cd20. Hydrostatic pressure is proposed to enhance the superconducting transition temperature in these materials.

Keywords:
Cecagecompoundsheavy-fermion systemssuperconductivity

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Quantum Materials

Background:

  • Cerium-based ternary compounds CeNi2Cd20 and CePd2Cd20 lack long-range order at millikelvin temperatures.
  • Reduced super-exchange and Ruderman-Kittel-Kasuya-Yosida interactions suggest unconventional electronic ground states.

Purpose of the Study:

  • Investigate the ground state of CeNi2Cd20 and CePd2Cd20.
  • Propose methods to enhance superconducting properties.

Main Methods:

  • Utilized an extended periodic Anderson lattice model.
  • Incorporated long-range and local Coulomb interactions.
  • Employed the slave-boson approach to study electron correlations.

Main Results:

  • Nodal superconductivity mediated by valence fluctuations is identified as the ground state.
  • Repulsive electron-electron interactions drive the emergence of d-wave superconductivity.
  • Hydrostatic pressure is predicted to increase the superconducting transition critical temperature.

Conclusions:

  • CeNi2Cd20 and CePd2Cd20 exhibit nodal superconductivity due to valence fluctuations.
  • Applying hydrostatic pressure is a viable strategy to enhance superconductivity in these materials.