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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

Physical Review Letters

|September 28, 2010

Summary

This summary is machine-generated.

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.

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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.