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Highly anisotropic gap function in borocarbide superconductor LuNi(2)B(2)C.

E Boaknin1, R W Hill, C Proust

  • 1Canadian Institute for Advanced Research, Department of Physics, University of Toronto, Toronto, Ontario M5S 1A7, Canada.

Physical Review Letters
|December 12, 2001
PubMed
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This study reveals that the borocarbide superconductor LuNi(2)B(2)C exhibits delocalized quasiparticles at low energies, evidenced by rapid conduction growth as vortices enter. This suggests a highly anisotropic superconducting gap, similar to heavy-fermion superconductors.

Area of Science:

  • Condensed matter physics
  • Superconductivity research
  • Materials science

Background:

  • Borocarbide superconductors like LuNi(2)B(2)C are technologically significant.
  • Understanding the nature of the superconducting gap is crucial for applications.
  • Previous studies suggest complex superconducting behavior in LuNi(2)B(2)C.

Purpose of the Study:

  • To investigate the thermal conductivity of LuNi(2)B(2)C at very low temperatures and high magnetic fields.
  • To determine the presence and nature of quasiparticles at the lowest energy states.
  • To elucidate the gap structure of LuNi(2)B(2)C and compare it to other superconductors.

Main Methods:

  • Measurements of thermal conductivity were performed on LuNi(2)B(2)C down to 70 mK.
  • A magnetic field was applied perpendicular to the heat current, ranging from 0 T to above the upper critical field (H(c2) = 7 T).

Related Experiment Videos

  • The field dependence of thermal conductivity was analyzed to infer the presence of delocalized quasiparticles and gap anisotropy.

    • Main Results:

    • Thermal conductivity increased rapidly as vortices entered the sample at low temperatures (T-->0).
    • This rapid increase unambiguously indicates the presence of delocalized quasiparticles at the lowest energies.
    • The magnetic field dependence of thermal conductivity closely resembles that of UPt(3), a known nodal superconductor, and differs significantly from s-wave superconductors.

    Conclusions:

    • LuNi(2)B(2)C exhibits strong evidence for a highly anisotropic superconducting gap.
    • The presence of nodes in the superconducting gap of LuNi(2)B(2)C is strongly suggested.
    • The findings position LuNi(2)B(2)C as a superconductor with characteristics similar to heavy-fermion systems.