High Field Superconducting Phases of Ultra Clean Single Crystal UTe2

• DOI: 10.7566/jpsj.93.123702
• Publication Date: 2024-11-13T01:00:54Z
• Authors: Dai Aoki; Ilya Sheikin; Nils Marquardt; Gerard Lapertot; Jacques Flouquet; Georg Knebel
• Keywords: [PHYS]Physics [physics]; Condensed Matter - Strongly Correlated Electrons; Condensed Matter - Superconductivity; 500; 530

We report the magnetoresistance of high-quality single crystals UTe 2 with T c = 2.1 K in high magnetic fields up to 36 T, field direction between b and c-axes.From angular dependence upper critical H c2 , we found that field-reentrant superconducting phase near ∥ b-axis extends a angle (θ ∼ 24 deg) from c-axis, where another begins appear above metamagnetic transition field, m .Our results suggest superconductivity below is closely related when tilted toward c-axis.Superconductivity appears be robust maintained perpendicular magnetization easy axis, implying fluctuations boosting may persist.At first glance, these findings resemble (reinforced) observed ferromagnetic superconductors URhGe UCoGe, Ising-type play crucial role.However, are more complex.The contrasts initial slope revealing anisotropic response fluctuations.Thanks samples, quantum oscillations were detected for directions close c-axis using (Shubnikov-de Haas effect) torque (de Haas-van Alphen measurements.The frequencies good agreement those previously field-modulation technique, confirming quasi-two dimensional Fermi surfaces.