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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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p-wave superconductivity in iron-based superconductors.

E F Talantsev1,2, K Iida3,4, T Ohmura3

  • 1M. N. Mikheev Institute of Metal Physics, Ural Branch, Russian Academy of Sciences, 18S. Kovalevskoy St., Ekaterinburg, 620108, Russia. evgeny.talantsev@imp.uran.ru.

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|October 4, 2019
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Summary
This summary is machine-generated.

This study provides strong evidence for p-wave pairing in iron-based superconductors like NdFeAs(O,F) and FeSe. These findings suggest p-wave superconductivity is a general feature in this material class.

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Superconductivity

Background:

  • P-wave pairing in superconductors, proposed over 50 years ago, remains experimentally elusive due to similarities with s-wave and d-wave states.
  • Distinguishing p-wave states requires precise measurement of fundamental superconducting properties.

Purpose of the Study:

  • To investigate the pairing symmetry in iron-based superconductors, specifically NdFeAs(O,F) and FeSe.
  • To determine if p-wave superconductivity is a general characteristic of iron-based superconductors.

Main Methods:

  • Analysis of self-field critical current in NdFeAs(O,F) thin films.
  • Extraction of London penetration depth, superconducting energy gap, and specific heat jump.
  • Re-examination of superfluid density measurements across various iron-based superconductors.

Main Results:

  • Physical parameters of NdFeAs(O,F) strongly indicate bulk p-wave superconductivity.
  • Single atomic layer FeSe also exhibits p-wave pairing.
  • General analysis confirms single-band, weak-coupling p-wave superconductivity in iron-based superconductors.

Conclusions:

  • NdFeAs(O,F) and FeSe are identified as p-wave superconductors.
  • P-wave pairing is a prevalent characteristic of iron-based superconductors.