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Magnetic field-temperature phase diagram along the magnetic hard axis for spin-triplet superconductor UTe$$_2$$

Sakai, Hironori   ; Tokiwa, Yoshifumi  ; Opletal, P.  ; Kimata, Motoi*; Awaji, Satoshi*; Sasaki, Takahiko*; Aoki, Dai*; Kambe, Shinsaku  ; Tokunaga, Yo  ; Haga, Yoshinori   

For a paramagnetic superconductor UTe$$_2$$, a "field-reionforced superconducting state" in which $$T_{rm c}$$ increases with magnetic field above 15 T emerges when a magnetic field is applied "exactly" in the direction of the magnetically hard $$b$$ axis. In order to investigate this high-field superconducting phase, we have attempted to determine the magnetic field-temperature phase diagram of ultra-clean single crystals using a cryogen-free 25 T superconducting magnet (25T-CSM) at the High Field Laboratory for Superconducting Materials, Institute for Materials Research, Tohoku University. In this presentation, we will report the obtained results.

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