Spin-triplet superconducting state in the nearly ferromagnetic compound UTe2

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 with no indication of magnetic ordering. Unusual properties of Hc2, NMR Knight shift, and specific heat 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, reflect a new kind of exotic superconductivity rooted in magnetic fluctuations and quantum dimensionality [2]. Application of pressure reveals a two-fold enhancement of this unusual superconductivity, which is closely related to the suppression of Kondo coherence [3]. In this talk, I will review our recent results on UTe2.

[1] S. Ran, et al, Nearly ferromagnetic spin-triplet superconductivity, Science, Vol. 365, Issue 6454, pp. 684-687
[2] S. Ran, et al, Extreme magnetic field-boosted superconductivity, Nature Physics Vol. 15, Issue 10
[3] S. Ran, et al, Enhanced spin triplet superconductivity due to Kondo destabilization, arXiv: 1909.06932