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Related Experiment Videos

First-order superconducting phase transition in CeCoIn5.

A Bianchi1, R Movshovich, N Oeschler

  • 1Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA.

Physical Review Letters
|September 13, 2002
PubMed
Summary

The superconducting phase transition in heavy fermion CeCoIn5 becomes first order above 4.7 T due to Pauli limiting. This transition shows sharp anomalies in specific heat and thermal expansion, indicating a significant change in material properties.

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Area of Science:

  • Condensed matter physics
  • Materials science

Background:

  • Heavy fermion compounds exhibit complex electronic behaviors.
  • CeCoIn5 is a well-studied heavy fermion superconductor with a critical temperature (Tc) of 2.3 K.

Purpose of the Study:

  • Investigate the nature of the superconducting phase transition in CeCoIn5 under a magnetic field.
  • Determine the conditions under which the transition changes from second order to first order.

Main Methods:

  • Measurements of specific heat and thermal expansion.
  • Application of magnetic fields parallel to the [001] crystallographic direction.

Main Results:

  • The superconducting phase transition in CeCoIn5 becomes first order for magnetic fields (H) exceeding 4.7 T applied parallel to [001].

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  • This transition occurs at temperatures below approximately 0.31Tc.
  • Observed phenomena include sharpened specific heat and thermal expansion anomalies, a notable magnetocaloric effect, and a steplike change in sample volume.

    • Conclusions:

    • The observed first-order superconducting transition is attributed to Pauli limiting, a phenomenon predicted for type-II superconductors.
    • This finding provides experimental evidence for theoretical predictions made in the 1960s regarding Pauli limiting effects in superconductors.