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Unconventional superconductivity in UTe$$_2$$

Aoki, Dai*; Brison, J.-P.*; Flouquet, J.*; Ishida, Kenji*; Knebel, G.*; Tokunaga, Yo  ; Yanase, Yoichi*

The novel spin-triplet superconductor candidate UTe$$_2$$ attracted enormous attention. We review key experimental and theoretical progress which has been achieved in different laboratories. UTe$$_2$$ has been expected to be close to a ferromagnetic instability, showing many similarities to the U-based ferromagnetic superconductors, URhGe and UCoGe. The competition between different types of magnetic interactions and the duality between the local and itinerant character of the 5 f Uranium electrons, as well as the shift of the U valence appear as key parameters in the rich phase diagrams discovered recently under extreme conditions like low temperature, high magnetic field, and pressure. We discuss macroscopic and microscopic experiments at low temperature to clarify the normal phase properties at ambient pressure for field applied along the three axis of this orthorhombic structure.



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Category:Physics, Condensed Matter



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