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Related Experiment Videos

Universal heat transport in Sr2RuO4.

M Suzuki1, M A Tanatar, N Kikugawa

  • 1Department of Physics, Kyoto University, Kyoto 606-8502, Japan.

Physical Review Letters
|June 13, 2002
PubMed
Summary

We found a finite residual term in the thermal conductivity of the unconventional superconductor Sr2RuO4, confirming its spin-triplet superconducting state and universal heat transport properties.

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Area of Science:

  • Condensed Matter Physics
  • Superconductivity
  • Materials Science

Background:

  • Sr2RuO4 is an unconventional superconductor with potential spin-triplet pairing.
  • Understanding its thermal properties is crucial for characterizing its unique superconducting state.

Purpose of the Study:

  • To investigate the temperature dependence of thermal conductivity (kappa(T)) in Sr2RuO4.
  • To provide evidence for unconventional pairing and universal heat transport in this material.

Main Methods:

  • Measurements of thermal conductivity were performed down to approximately 100 mK.
  • Analysis focused on the T-->0 K limit and the residual term of kappa/T.

Main Results:

  • A finite residual term in kappa/T was observed at low temperatures, indicating a superconducting state.
  • This residual term was independent of critical temperature (T(c)) variations, suggesting universal behavior.
  • The data implies strong impurity scattering with a phase shift near pi/2.

Conclusions:

  • The findings provide clear evidence for an unconventional, likely spin-triplet, superconducting pairing in Sr2RuO4.
  • The universality of heat transport is experimentally demonstrated, with a criterion for its observation deduced.
  • The results highlight the importance of impurity scattering in understanding the material's properties.

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