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Pairing mechanism in the ferromagnetic superconductor UCoGe
Beilun Wu1, Gaël Bastien1, Mathieu Taupin1,2
1Université Grenoble Alpes, CEA, INAC-PHELIQS, F-38000 Grenoble, France.
Nature Communications
|February 24, 2017
Summary
In ferromagnetic superconductor UCoGe, ferromagnetic spin fluctuations drive electron pairing. This mechanism quantitatively explains how pairing strength influences macroscopic superconducting properties, including the critical field.
Area of Science:
- Condensed matter physics
- Quantum mechanics
- Materials science
Background:
- Superconductivity arises from Cooper pairs, but the pairing mechanism, especially in strongly correlated unconventional superconductors, remains challenging to identify.
- Understanding electron pairing mechanisms is crucial for advancing theories of many-body phenomena and discovering new superconductors.
Purpose of the Study:
- To investigate the pairing mechanism in the ferromagnetic superconductor UCoGe.
- To demonstrate the role of ferromagnetic spin fluctuations in mediating superconductivity.
- To quantitatively link pairing strength to macroscopic superconducting properties.
Main Methods:
- Experimental investigation of the ferromagnetic superconductor UCoGe.
- Analysis of the field dependence of pairing strength.
- Correlation of pairing strength with macroscopic properties, specifically the superconducting upper critical field.
Main Results:
- The field dependence of pairing strength in UCoGe significantly impacts macroscopic superconducting properties.
- A quantitative understanding was achieved by linking pairing strength to the superconducting upper critical field.
- Ferromagnetic spin fluctuations were identified as the dominant pairing mechanism.
Conclusions:
- Ferromagnetic spin fluctuations play a dominant role in the pairing mechanism of UCoGe.
- The study provides a quantitative model for understanding superconductivity in this material.
- This work offers insights into pairing mechanisms in unconventional superconductors.
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