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Unusual superconducting state in the nearly ferromagnetic compound UTe2

Date: 2019-05-21
Time: 10:30
Venue: M253
Speaker: Dr. Sheng Ran

University of Maryland, America 


Our recent discovery of the novel spin-triplet superconductivity in UTe2 [1] has inspired a lot of interests in the community. Superconducting state of UTe2 closely resembles that of ferromagnetic superconductors, but the normal state is paramagnetic and shows no indication of magnetic ordering. UTe2 exhibits an extremely large, anisotropic upper critical field Hc2, temperature independent NMR Knight shift in the superconducting state, and a large residual normal electronic density of states. All these results strongly indicate that the superconductivity in UTe2 is carried by spin-triplet pairs. Even more striking, superconductivity reenters in the magnetic field of 45 tesla and persists up to 65 tesla, which is the upper limit of magnetic field in our current study [2]. These extreme properties reflect a new kind of exotic superconductivity rooted in magnetic fluctuations. In my talk, I will review our recent results on UTe2.

Brief CV of Dr. Sheng Ran: 

Dr. Ran is a currently a postdoc researcher at University of Maryland and a visiting scientist at NIST. He obtained PhD at Iowa State University under the supervision of Dr. Paul Canfield. He also worked as a postdoc researcher at UCSD in Dr. Brian Maple’s lab. His research has been dedicated to the discovery, synthesis and characterization of novel quantum materials with emergent phenomena and investigation of their underlying physics, including novel superconducting, topological materials, etc.


1. S. Ran, et al, Nearly ferromagnetic spin-triplet superconductivity, Science (accepted)

2. S. Ran, et al, Extreme magnetic field-boosted superconductivity, arXiv:1905.04343