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Electronic tuning and uniform superconductivity in CeCoIn5
1Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA. gofryk@lanl.gov
Physical Review Letters
|December 11, 2012
Summary
Electron and hole doping reversibly tune the magnetic phase diagram in CeCoIn(5). Nonmagnetic dopants show weak superconducting pair breaking, with hole dopants inducing magnetic moments having a weaker effect than electron dopants.
Area of Science:
- Condensed Matter Physics
- Materials Science
- Superconductivity
Background:
- CeCoIn(5) is a heavy fermion superconductor exhibiting complex magnetic phase diagrams.
- Understanding the interplay between magnetism and superconductivity is crucial for novel material design.
Purpose of the Study:
- To investigate the impact of electron and hole doping on the magnetic phase diagram of CeCoIn(5).
- To quantify the superconducting pair-breaking effects of different dopants.
- To elucidate the role of dopant site and induced magnetism in superconductivity.
Main Methods:
- Systematic doping studies using electron (Pt, Sn) and hole (Cd, Hg) dopants.
- Pressure-dependent measurements to extract pair-breaking parameters.
- Codoping studies to probe site-specific effects.
- Density Functional Theory (DFT) calculations for theoretical insights.
Main Results:
- Electron and hole doping induce a globally reversible tuning of the magnetic phase diagram in CeCoIn(5).
- Nominally nonmagnetic dopants exhibit a weak superconducting pair-breaking effect for the d-wave superconductor.
- Hole dopants, which induce magnetic moments, show a weaker pair-breaking effect compared to electron dopants.
- Pt and Sn doping produce similar superconducting effects despite occupying different sites, challenging existing models of superconductivity localization.
Conclusions:
- Electronic tuning offers a powerful route to control magnetic and superconducting properties in CeCoIn(5).
- The weak pair-breaking effect of dopants highlights the robustness of d-wave superconductivity in this system.
- The results suggest that superconductivity is not confined to specific planes within the CeCoIn(5) structure.
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