Bulletin of the American Physical Society
APS March Meeting 2023
Volume 68, Number 3
Las Vegas, Nevada (March 5-10)
Virtual (March 20-22); Time Zone: Pacific Time
Session W27: Superconductivity:Heavy Fermions
3:00 PM–5:48 PM,
Thursday, March 9, 2023
Room: Room 219
Sponsoring
Unit:
DCMP
Chair: Kalyan Sasmal, Department of Physics, University of California, San Diego.
Abstract: W27.00006 : Thermodynamic evidence for the anisotropic field-induced change of the superconducting order parameter in the chiral superconductor candidate UTe2.
4:00 PM–4:12 PM
Presenter:
Andrew J Woods
(Los Alamos National Laboratory)
Authors:
Andrew J Woods
(Los Alamos National Laboratory)
Sangyun Lee
(Los Alamos National Laboratory)
Priscila Rosa
(Los Alamos National Laboratory)
Sean Thomas
(Los Alamos National Laboratory)
Eric D Bauer
(Los Alamos Natl Lab)
Shizeng Lin
(Los Alamos National Laboratory)
Roman Movshovich
(Los Alamos Natl Lab)
Our sample of UTe2 exhibits a single specific heat anomaly at the superconducting transition temperature Tc ≈ 2 K and a small zero-field residual Sommerfeld coefficient γ0 = C/T (T=0) ≈ 10 mJ mol-1K-2. The magnetic field evolution of the residual Sommerfeld coefficient γ0(H) is distinct for the three field directions. In magnetic fields to 4 T for fields along a, b, and c axes, we find that γ0 ≈ αi√H, with i=a,b,c, as expected for a nodal superconductor; however, we observe a striking change of behavior of γ0(H) above 4 T. A well-pronounced kink in γ0(H) is observed at 4 T for H || a,b, whereas a smooth change from square-root to linear behavior is observed around 4 T for H || c. These results strongly indicate that the zero-field superconducting ground state is stable to 4 T and undergoes a field-induced change above 4 T. At low fields, the nodes appear to be predominantly located in the ab plane. Above 4 T, the change in the superconducting order parameter is strongest when the field is applied in the ab plane, with nodes moving away from the direction of the applied field. We will discuss the implications of our results for the determination of the superconducting order parameter in UTe2 at high fields.
Follow Us |
Engage
Become an APS Member |
My APS
Renew Membership |
Information for |
About APSThe American Physical Society (APS) is a non-profit membership organization working to advance the knowledge of physics. |
© 2024 American Physical Society
| All rights reserved | Terms of Use
| Contact Us
Headquarters
1 Physics Ellipse, College Park, MD 20740-3844
(301) 209-3200
Editorial Office
100 Motor Pkwy, Suite 110, Hauppauge, NY 11788
(631) 591-4000
Office of Public Affairs
529 14th St NW, Suite 1050, Washington, D.C. 20045-2001
(202) 662-8700