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Spin Resonance and Magnetic Order in an Unconventional Superconductor
D G Mazzone1, S Raymond2, J L Gavilano1
1Laboratory for Neutron Scattering and Imaging, Paul Scherrer Institut, 5232 Villigen PSI, Switzerland.
Physical Review Letters
|December 9, 2017
Summary
Magnetic fluctuations drive unconventional superconductivity. We found that static magnetic order does not affect the spin resonance in a d-wave superconductor model, suggesting a longitudinal magnetic resonance mode.
Area of Science:
- Condensed Matter Physics
- Materials Science
- Quantum Materials
Background:
- Unconventional superconductivity is often linked to magnetic fluctuations.
- The interplay between magnetic order and superconductivity, particularly the magnetic spin resonance, remains poorly understood in many materials.
Purpose of the Study:
- To investigate how static magnetic order emerges from a superconducting state.
- To understand the competition between static magnetic order and the magnetic spin resonance in unconventional superconductors.
Main Methods:
- Theoretical study of a model d-wave superconductor.
- Analysis of the emergence of spin-density wave order within the superconducting condensate.
Main Results:
- The spin resonance in the model d-wave superconductor remains unaffected by the onset of static spin-density wave order.
- This finding suggests that the spin resonance can coexist with static magnetic order.
Conclusions:
- The observed spin resonance in materials like Nd$_{0.05}$Ce$_{0.95}$CoIn$_{5}$ may represent a longitudinal magnetic excitation.
- This longitudinal mode likely involves fluctuations along the direction of the ordered magnetic moments, coexisting with the superconducting condensate.
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