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Types Of Superconductors01:28

Types Of Superconductors

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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Tailoring Superconductivity with Two-Level Systems.

Joshuah T Heath1,2, Alexander C Tyner1,2, S Pamir Alpay3,4

  • 1KTH Royal Institute of Technology, Stockholm University, Nordita, Hannes Alfvéns väg 12, SE-106 91 Stockholm, Sweden.

Physical Review Letters
|June 12, 2026
PubMed
Summary
This summary is machine-generated.

Two-level systems (TLSs) can enhance or suppress superconductivity by altering the critical temperature and superconducting gap. Engineering TLS properties offers new ways to tailor superconducting materials like aluminum.

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Area of Science:

  • Condensed Matter Physics
  • Materials Science

Background:

  • Superconductivity is a quantum mechanical phenomenon with critical temperature (Tc) and superconducting gap (Δ) as key properties.
  • Defects and localized modes can significantly influence superconducting properties.

Purpose of the Study:

  • To investigate the impact of two-level systems (TLSs) on superconductivity.
  • To understand how TLSs affect the critical temperature and superconducting gap.
  • To explore the potential for TLS engineering in tailoring superconducting materials.

Main Methods:

  • Modeling two-level systems (TLSs) as soft modes localized in real space.
  • Quantitative analysis using thin-film aluminum as a case study.
  • Investigating the dependence of TLS impact on surface density and average frequency.

Main Results:

  • Two-level systems (TLSs) can either enhance or suppress the superconducting critical temperature (Tc).
  • The effect of TLSs on Tc and the zero-temperature superconducting gap (Δ) is dependent on their surface density and average frequency.
  • Quantitative description of TLS influence on Tc and Δ in thin-film aluminum.

Conclusions:

  • TLSs are crucial defects that can be engineered to tune superconducting properties.
  • TLS engineering presents new avenues for developing advanced superconducting materials.
  • The findings provide a framework for understanding and controlling superconductivity through defect manipulation.