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Related Experiment Videos

Gap function with point nodes in borocarbide superconductor YNi2B2C.

K Izawa1, K Kamata, Y Nakajima

  • 1Institute for Solid State Physics, University of Tokyo, Kashiwa, Chiba 277-8581, Japan.

Physical Review Letters
|September 13, 2002
PubMed
Summary

Researchers investigated the superconducting gap function of YNi2B2C using thermal conductivity measurements. The study reveals a unique gap structure with point nodes, challenging current theories on superconductivity pairing mechanisms.

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Superconductivity

Background:

  • Understanding the superconducting gap function is crucial for elucidating pairing mechanisms.
  • YNi2B2C is a well-studied superconductor exhibiting complex electronic properties.

Purpose of the Study:

  • To determine the superconducting gap function of YNi2B2C.
  • To investigate the influence of magnetic field orientation on thermal conductivity.

Main Methods:

  • Measurement of c-axis thermal conductivity (kappa(zz)) in YNi2B2C.
  • Rotation of magnetic field (H) in various directions, including within the ab plane and conically around the c-axis.

Main Results:

  • Observed a peculiar fourfold oscillation in kappa(zz) with narrow cusps as H rotated in the ab plane.

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  • The amplitude of oscillations significantly decreased when H was tilted 45 degrees from the c-axis.
  • These findings provide evidence for point nodes in the superconducting gap function along the a and b axes.

    • Conclusions:

    • The superconducting gap function of YNi2B2C possesses point nodes.
    • This nodal gap structure challenges existing models of the electron pairing mechanism in superconductors.