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Related Experiment Videos

Superconductivity and quantum criticality in CeCoIn5.

V A Sidorov1, M Nicklas, P G Pagliuso

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

Physical Review Letters
|October 9, 2002
PubMed
Summary
This summary is machine-generated.

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Electrical resistivity measurements on CeCoIn5 reveal a significant crossover near 1.6 GPa, impacting superconductivity. This finding connects heavy-fermion physics to cuprate behavior, suggesting a possible pseudogap phase.

Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Superconductivity

Background:

  • Heavy-fermion superconductors like CeCoIn5 exhibit complex electronic behaviors.
  • Understanding the interplay between pressure, temperature, and electronic properties is crucial for advancing superconductivity research.

Purpose of the Study:

  • To investigate the impact of high pressure on the electrical resistivity and superconducting properties of a CeCoIn5 single crystal.
  • To construct a temperature-pressure phase diagram and explore connections to other strongly correlated electron systems.

Main Methods:

  • Single crystal electrical resistivity measurements were performed under hydrostatic pressures up to 4.2 GPa.
  • Analysis of resistivity data across a range of temperatures and pressures to identify phase transitions and crossovers.

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Main Results:

  • A distinct crossover in transport properties was observed near a critical pressure (P*) of approximately 1.6 GPa.
  • The superconducting transition temperature (Tc) exhibited a maximum near this critical pressure.
  • The constructed temperature-pressure phase diagram shows similarities to the physics observed in cuprate superconductors.

Conclusions:

  • The study reveals a pressure-induced electronic state change in CeCoIn5 around 1.6 GPa.
  • The findings suggest a potential link between heavy-fermion superconductivity and the physics of cuprates, including the possible emergence of a pseudogap.