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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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Metallic solids such as crystals of copper, aluminum, and iron are formed by metal atoms. The structure of metallic crystals is often described as a uniform distribution of atomic nuclei within a “sea” of delocalized electrons. The atoms within such a metallic solid are held together by a unique force known as metallic bonding that gives rise to many useful and varied bulk properties.
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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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Isomerism in Complexes
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Color in Coordination Complexes
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The New Superconductor tP-SrPd2Bi2: Structural Polymorphism and Superconductivity in Intermetallics.

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Structural polymorphism in strontium palladium bismuthide (SrPd2Bi2) dictates superconductivity. The tetragonal phase exhibits superconductivity at 2.0 K, while the monoclinic phase does not, highlighting the importance of crystal structure.

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Solid State Chemistry

Background:

  • Structural polymorphism can significantly influence the physical properties of materials.
  • The 1-2-2 phases are a class of compounds with potential for interesting electronic behaviors.

Purpose of the Study:

  • To investigate the superconducting properties of two polymorphs of SrPd2Bi2.
  • To understand the relationship between crystal structure and superconductivity in SrPd2Bi2.

Main Methods:

  • Synthesis of SrPd2Bi2 in tetragonal (CaBe2Ge2-type) and monoclinic (BaAu2Sb2-type) forms by controlling synthesis temperature.
  • Characterization of the crystallographic structures of both polymorphs.
  • Measurement of superconducting properties, including critical temperature (Tc).

Main Results:

  • SrPd2Bi2 was synthesized in two distinct crystallographic forms: tetragonal and monoclinic.
  • The tetragonal SrPd2Bi2 polymorph was found to be superconducting at 2.0 K.
  • The monoclinic SrPd2Bi2 polymorph did not exhibit superconductivity under the same conditions.

Conclusions:

  • The crystal structure of SrPd2Bi2 plays a crucial role in its superconducting behavior.
  • Structural instability, as indicated by polymorphism, is linked to the emergence of superconductivity in this system.
  • These findings contribute to the understanding of structure-property relationships in 1-2-2 superconducting phases.