Bulletin of the American Physical Society
APS March Meeting 2024
Monday–Friday, March 4–8, 2024; Minneapolis & Virtual
Session S08: Superconductivity in Heavy Fermion Compounds and Other Platforms
8:00 AM–11:00 AM,
Thursday, March 7, 2024
Room: L100I
Sponsoring
Unit:
DCMP
Chair: Peter Czajka, NIST
Abstract: S08.00006 : Theory of magnetic field enhanced triplet superconductivity in next generation ultraclean UTe2
9:00 AM–9:12 AM
Presenter:
Daniel Shaffer
(University of Wisconsin, Madison)
Authors:
Daniel Shaffer
(University of Wisconsin, Madison)
Dmitry V Chichinadze
(National High Magnetic Field Laboratory)
Theodore I Weinberger
(Univ of Cambridge)
Jiasheng Chen
(Univ of Cambridge)
Andrej Cabala
(Charles University)
Jirí Pospíšil
(Charles University)
Zheyu Wu
(University of Cambridge)
Jan Prokleska
(Charles University)
Tetiana Haidamak
(Charles University)
Gaël Bastien
(Charles University)
Vladimír Sechovsky
(Charles University)
Alexander J Hickey
(University of Cambridge)
Shermane M Benjamin
(The National High Magnetic Field Laboratory)
David E Graf
(Florida State University)
Yurii Skourski
(Hochfeld-Magnetlabor)
Gilbert G Lonzarich
(University of Cambridge)
Michal Vališka
(Charles University)
Friedrich M Grosche
(University of Cambridge)
Alexander G Eaton
(University of Cambridge)
M. J Mancera-Ugarte
(University of Cambridge)
Remarkably, in these new samples SC2 is observed over a much broader range of field directions, suggesting disorder- and field direction-sensitive magnetic fluctuations as the pairing glue in the SC2 phase. We propose in particular that these are metamagnon fluctuations that occur about the polarised paramagnet local minimum of the magnetic free energy. This minimum becomes global above the metamagnetic phase transition, explaining why SC2 suddenly terminates at the metamagnetic phase transition when the magnetic field reaches the critical value Hm. As Hm decreases under pressure, consistent with Kondo lattice physics, our model also helps explain why the SC2 phase appears at zero field and with increasing critical temperature when pressure is applied.
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