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Lifshitz Transitions in the Ferromagnetic Superconductor UCoGe
Gaël Bastien1,2, Adrien Gourgout1,2, Dai Aoki1,2,3
1University Grenoble Alpes, INAC-PHELIQS, F-38000 Grenoble, France.
Physical Review Letters
|November 26, 2016
Summary
High magnetic fields reveal five anomalies in the ferromagnetic superconductor UCoGe, showing quantum oscillations and changes in effective mass. These findings suggest field-induced Fermi surface instabilities in this unique material.
Area of Science:
- Condensed Matter Physics
- Materials Science
- Quantum Materials
Background:
- UCoGe is an Ising-type ferromagnetic superconductor, exhibiting complex interplay between magnetism and superconductivity.
- Understanding its electronic properties under extreme conditions is crucial for novel quantum phenomena.
Purpose of the Study:
- To investigate the electronic properties of UCoGe under high magnetic fields.
- To identify field-induced electronic phase transitions and their impact on superconductivity.
Main Methods:
- High magnetic field (up to 21 T) magnetoresistance, Hall effect, and thermopower measurements.
- Analysis of magnetic quantum oscillations in resistivity and thermoelectric power.
- Determination of effective mass changes at different field anomalies.
Main Results:
- Five distinct anomalies observed at specific magnetic field strengths (≈4, 9, 12, 16, 21 T).
- Magnetic quantum oscillations detected, with significant changes in frequency and effective mass at anomalies.
- Evidence for successive Fermi surface instabilities driven by magnetic polarization.
Conclusions:
- High magnetic fields induce significant changes in the electronic structure of UCoGe.
- Observed instabilities are linked to field-dependent magnetic polarization and Fermi surface reconstruction.
- These results offer insights into the field-tuned quantum states in ferromagnetic superconductors.
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