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Types Of Superconductors

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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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When two or more atoms come together to form a molecule, their atomic orbitals combine and molecular orbitals of distinct energies result. In a solid, there are a large number of atoms, and therefore a large number of atomic orbitals that may be combined into molecular orbitals. These groups of molecular orbitals are so closely placed together to form continuous regions of energies, known as the bands.
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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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There is variation in the electrical conductivity of materials - metals, semiconductors, and insulators that are showcased with the help of the energy band diagrams.
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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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Color in Coordination Complexes
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Multiband Semimetallic Electronic Structure of Superconducting Ta2PdSe5.

David Joseph Singh1

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We studied the electronic structure of the superconductor Ta2PdSe5 using density functional calculations. Our findings reveal a semimetallic nature, supporting two-band superconductivity despite a noted discrepancy in specific heat possibly due to sample composition.

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Area of Science:

  • Condensed matter physics
  • Materials science
  • Solid-state chemistry

Background:

  • Ta2PdSe5 is a material exhibiting superconductivity.
  • Understanding its electronic structure is key to explaining its superconducting properties.

Purpose of the Study:

  • To investigate the electronic structure and related properties of Ta2PdSe5.
  • To elucidate the origins of its semimetallic superconductivity.

Main Methods:

  • Density functional calculations were employed.
  • Analysis of the Fermi surface topology and electronic band structure.

Main Results:

  • The Fermi surface consists of two disconnected sheets derived from chalcogenide p states.
  • Ta2PdSe5 exhibits a semimetallic character with hole and electron carriers.
  • Results support two-band superconductivity, with a caveat regarding specific heat data.

Conclusions:

  • The electronic structure calculations provide insights into the superconductivity of Ta2PdSe5.
  • A discrepancy in specific heat may be attributed to palladium (Pd) deficiency in experimental samples.
  • Further investigation into sample stoichiometry is warranted.