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Our recent discovery of the novel spin-triplet superconductivity in UTe2 has inspired a lot of interests in the community [1-3]. 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. These extreme properties reflect a new kind of exotic superconductivity rooted in magnetic fluctuations and quantum dimensionality. Application of pressure reveals a two-fold enhancement of this unusual superconductivity, which is closely related to the suppression of Kondo coherence. In this talk, I will review our recent results on UTe2.
1. Sheng Ran, Chris Eckberg, Qing-Ping Ding, Yuji Furukawa, Shanta R. Saha, I-Lin Liu, Mark Zic, Johnpierre Paglione and Nicholas P. Butch, “Nearly ferromagnetic spin-triplet superconductivity”, Science, Vol. 365, Issue 6454, pp. 684-687, (2019)
2. Sheng Ran, I-Lin Liu, YunSuk Eo, Daniel J. Campbell, Paul Neves, Wesley T. Fuhrman, Shanta R. Saha, Chris Eckberg, Hyunsoo Kim, Johnpierre Paglione, David Graf, John Singleton and Nicholas P. Butch, “Extreme magnetic field-boosted superconductivity”, Nature Physics, 15, 1250-1254 (2019)
3. Lin Jiao, Sean Howard, Sheng Ran, Zhenyu Wang, Jorge Olivares Rodriguez, Manfred Sigrist, Ziqiang Wang, Nicholas P. Butch, Vidya Madhavan, “Chiral superconductivity in heavy fermion metal UTe2”, Nature, 579, 523-527 (2020)
Sheng Ran obtained his bachelor from Fudan University in 2008. He did his PhD in Dr. Paul Canfield’s group in Iowa State University, focusing on iron based superconductors. After PhD, he did his postdoc in Dr. Brian Maple’s group in UCSD, and later on in Dr. Nick Butch’s group in NIST/University of Maryland. For years, Sheng Ran’s research aims to realize and understand exotic states of quantum materials, using combined techniques of bulk crystal synthesis, electric and thermal transport measurements under extreme temperature, pressure and magnetic field conditions, and neutron and high energy X-ray scattering. He received 2020 The Lee Osheroff Richardson Science Prize for North and South America for his discovery of spin triplet superconductor UTe2 and its high field superconductivity.