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Types Of Superconductors01:28

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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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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The conduction of free electrons inside a conductor is best described by quantum mechanics. However, a classical model makes predictions close to the results of quantum mechanics. It is called the theory of metallic conduction.
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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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An ionic compound is stable because of the electrostatic attraction between its positive and negative ions. The lattice energy of a compound is a measure of the strength of this attraction. The lattice energy (ΔHlattice) of an ionic compound is defined as the energy required to separate one mole of the solid into its component gaseous ions. For the ionic solid sodium chloride, the lattice energy is the enthalpy change of the process:
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Giant Two-Level Systems in a Granular Superconductor.

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Summary
This summary is machine-generated.

Disordered thin films in quantum circuits can have defects. This study found unusually large electric dipole moments in granular aluminum films, suggesting new insights for quantum information applications.

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Area of Science:

  • Materials Science
  • Quantum Physics
  • Condensed Matter Physics

Background:

  • Disordered thin films are crucial for superconducting circuits in quantum information and particle detection.
  • These films, while offering low microwave losses, contain intrinsic defects like two-level systems (TLS).
  • TLS, originating from dielectric defects, can negatively impact quantum circuit performance.

Purpose of the Study:

  • To experimentally investigate two-level systems (TLS) in granular aluminum thin films.
  • To understand the influence of mechanical strain and electric fields on TLS behavior.
  • To characterize the electric dipole moments of TLS in these materials.

Main Methods:

  • Experimental investigation of granular aluminum thin films.
  • Application of mechanical strain and electric fields.
  • Analysis of two-level system (TLS) properties, including electric dipole moments.

Main Results:

  • Identified a class of strongly coupled TLS with exceptionally large electric dipole moments (up to 30 eÅ).
  • Observed that these large dipole moments are more prevalent in higher resistivity films.
  • These findings indicate a significant deviation from commonly reported dipole moments for solid-state defects.

Conclusions:

  • The study reveals novel characteristics of TLS in granular superconductors.
  • The large electric dipole moments suggest unique defect properties in these materials.
  • These findings have potential implications for the use of granular superconductors in quantum circuit applications.