- Atsushi Miyake: Metamagnetic transition in heavy fermion superconductor UTe2
- 31. 3. 2021, 10:10
- online (zoom)
- online meetink link (Passcode will be provided on request)
- more information
Abstract:
Recently discovered paramagnetic heavy-fermion superconductor UTe2 attracts significant attention due to its unconventional superconductivity (SC) [1, 2]. The superconducting transition temperature of Tsc = 1.6 K is relatively high among uranium superconductors, and the SC in UTe2 is believed to be of a spin-triplet type. In contrast to the previous spin-triplet ferromagnetic (FM) SC, the SC of UTe2 emerges inthe PM state, which seems to locate near an FM phase. A similarity to the FMSC [3] is field-reentrantSC for H || b-axis, which is perpendicular to the easy magnetization a-axis at low fields [4]. It is expected that magnetic fluctuations would drastically develop at high fields.To reveal high-field properties of UTe2 for H || b, we have studied magnetization and specific heat of single crystal of UTe2 in pulsed-magnetic fields and observed metamagnetic transition at 35 T with significant enhancement of effective mass [6, 7]. In this talk, we will discuss the relation between metamagnetic transition and re-entrant SC by comparing FMSC.
References
[1] S. Ran et al., Science 365, 684 (2019).
[2] D. Aoki et al., J. Phys. Soc. Jpn. 88, 043702 (2019).
[3] D. Aoki et al., J. Phys. Soc. Jpn. 88, 022001 (2019).
[4] G. Knebel et al., J. Phys. Soc. Jpn. 88, 063707 (2019).
[6] A. Miyake et al., J. Phys. Soc. Jpn. 88, 063706 (2019).
[7] S. Imajo et al., J. Phys. Soc. Jpn. 88, 083705 (2109).