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Superconducting quantum critical point in CeCoIn(5-x)Sn(x)
S M Ramos1, M B Fontes, E N Hering
1Centro Brasileiro de Pesquisas Físicas, Rua Dr. Xavier Sigaud 150, 22290-180, Rio de Janeiro, RJ, Brazil. smr@if.uff.br
Researchers studied the heavy fermion superconductor CeCoIn5 under pressure and tin doping, finding a single mechanism drives superconductivity to zero. This reveals insights into quantum critical points in heavy fermion systems.
Area of Science:
- Condensed Matter Physics
- Quantum Materials Science
Background:
- Heavy fermion superconductors like CeCoIn5 exhibit complex electronic behavior.
- Understanding the suppression of superconductivity near quantum critical points is crucial for materials science.
Purpose of the Study:
- To investigate the superconducting phase transition in CeCoIn5 under combined pressure and tin doping.
- To identify the underlying mechanism driving superconductivity to zero temperature (Tc→0).
Main Methods:
- Performed temperature-pressure-dependent electrical resistivity measurements.
- Analyzed the phase diagram across varying tin concentrations and applied pressures.
Main Results:
- Observed a universal phase diagram indicating a single mechanism governs the reduction of Tc.
- Identified the proximity to a superconducting quantum critical point.
Conclusions:
- A two-band model with pressure- and doping-controlled hybridization consistently explains the phase diagram.
- This model accounts for the suppression of d-wave superconductivity in CeCoIn5.
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