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Superconductor01:24

Superconductor

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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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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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Imperfections in Crystal Structure: Stoichiometric Point Defects01:26

Imperfections in Crystal Structure: Stoichiometric Point Defects

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Schottky defects arise when some lattice points in a crystal, such as those in NaCl, remain unoccupied, creating lattice vacancies without disturbing the overall electrical neutrality of the crystal. This defect is common in ionic crystals where the positive and negative ions are similar in size, as seen in sodium chloride and cesium chloride. The presence of Schottky defects enables the crystal to conduct electricity to a small extent through an ionic mechanism. Electric fields cause nearby...
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Theory of Metallic Conduction01:17

Theory of Metallic Conduction

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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.
In this theory, Newton's second law of motion is used to determine the acceleration of an electron in the presence of an applied electric field. Then, its velocity is expressed via this acceleration.
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Ferromagnetism01:31

Ferromagnetism

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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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Electric Field Inside a Conductor01:20

Electric Field Inside a Conductor

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When a conductor is placed in an external electric field, the free charges in the conductor redistribute and very quickly reach electrostatic equilibrium. The resulting charge distribution and its electric field have many interesting properties, which can be investigated with the help of Gauss's law.
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A disorder-enhanced quasi-one-dimensional superconductor.

A P Petrović1, D Ansermet1, D Chernyshov2

  • 1Division of Physics and Applied Physics, School of Physical and Mathematical Sciences, Nanyang Technological University, 637371 Singapore.

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|July 23, 2016
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Disorder unexpectedly enhanced superconductivity in quasi-1D materials like Na2-δMo6Se6. This finding challenges conventional understanding and opens new avenues for exploring correlated electron physics in low-dimensional systems.

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Quantum Mechanics

Background:

  • Quasi-1D (q1D) materials, weakly coupled 1D chains, are crucial for studying strongly correlated matter.
  • These materials exhibit long-range order but are sensitive to interactions and disorder due to anisotropy.
  • They offer potential for discovering novel emergent electronic phases.

Purpose of the Study:

  • To investigate the effect of disorder on superconducting instabilities in q1D materials.
  • To explore the potential for disorder to tune or induce new correlated electron physics.
  • To examine the behavior of single crystals of Na2-δMo6Se6, a q1D superconductor.

Main Methods:

  • Synthesis and characterization of single crystals of Na2-δMo6Se6.
  • Experimental investigation of superconducting properties under varying conditions.
  • Theoretical analysis of Coulomb interactions and disorder effects in q1D systems.

Main Results:

  • Observed unprecedented enhancement of superconducting instability due to disorder in Na2-δMo6Se6.
  • Demonstrated that disorder-enhanced Coulomb pair-breaking can be mitigated in these systems.
  • Identified a screened long-range Coulomb repulsion as a key factor in disordered q1D materials.

Conclusions:

  • Disorder can play a constructive role in enhancing superconductivity in specific low-dimensional materials.
  • The findings challenge the general notion that disorder is detrimental to superconductivity.
  • This work highlights the potential of disordered q1D materials for novel correlated electron phenomena.