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Zero-field quantum critical point in CeCoIn5.

Y Tokiwa1, E D Bauer2, P Gegenwart1

  • 1I. Physikalisches Institut, Georg-August-Universität Göttingen, 37077 Göttingen, Germany.

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|August 29, 2014
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Summary
This summary is machine-generated.

This study reveals hidden quantum criticality in the heavy-fermion metal CeCoIn5. Measurements show evidence for a quantum critical point at zero magnetic field in both normal and superconducting states.

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Area of Science:

  • Condensed Matter Physics
  • Quantum Materials

Background:

  • Heavy-fermion metals like CeCoIn5 exhibit complex electronic behavior.
  • Quantum criticality, a phase transition at absolute zero, influences material properties.

Purpose of the Study:

  • Investigate quantum criticality in CeCoIn5 across its normal and superconducting states.
  • Determine the presence and nature of a quantum critical point (QCP).

Main Methods:

  • Measurements of magnetic Grüneisen ratio (ΓH) and specific heat.
  • Experiments conducted at varying magnetic field orientations and temperatures down to 50 mK.

Main Results:

  • Observed universal scaling of ΓH in the normal state, indicating a hidden zero-field QCP.
  • Found increasing quasiparticle entropy towards zero field in the superconducting state.

Conclusions:

  • Experimental results provide strong evidence for a zero-field quantum critical point in CeCoIn5.
  • Quantum criticality significantly impacts both the normal and superconducting phases of this heavy-fermion metal.