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Field-induced quantum critical point in CeCoIn5
Johnpierre Paglione1, M A Tanatar, D G Hawthorn
1Department of Physics, University of Toronto, Toronto, Ontario, Canada M5S 1A7. paglione@physics.utoronto.ca
Physical Review Letters
|December 20, 2003
Summary
Researchers studied the heavy-fermion superconductor CeCoIn5, observing a field-induced quantum critical point (QCP) linked to superconductivity. This finding offers insights into quantum criticality in materials.
Area of Science:
- Condensed Matter Physics
- Quantum Materials Science
Background:
- Heavy-fermion superconductors exhibit complex electronic behavior.
- Understanding quantum critical points (QCPs) is crucial for novel material properties.
Purpose of the Study:
- Investigate the resistivity of CeCoIn5 under varying temperature and magnetic fields.
- Determine the relationship between non-Fermi liquid behavior, Fermi liquid state, and magnetic transitions.
Main Methods:
- Resistivity measurements of CeCoIn5 from 25 mK to low temperatures.
- Application of magnetic fields up to 16 T perpendicular to the basal plane.
Main Results:
- Observed suppression of non-Fermi liquid behavior (ρ ∝ T) with increasing magnetic field.
- Development of a Fermi liquid state (ρ = ρ(0) + AT²) and critical behavior of the A coefficient.
- Evidence for a field-induced quantum critical point (QCP) near the superconducting critical field H(c2).
Conclusions:
- A field-tuned QCP exists in CeCoIn5, coinciding with the superconducting critical field.
- The QCP is related to a magnetic state change, indicated by magnetoresistance shifts.
- This study provides insights into the interplay of superconductivity, quantum criticality, and magnetism.