Manipulating the nematic director by magnetic fields in the spin-triplet superconducting state of CuxBi2Se3
| Autor: | Yokoyama, M., Nishigaki, H., Ogawa, S., Nita, S., Shiokawa, H., Matano, K., Zheng, Guo-qing |
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| Rok vydání: | 2023 |
| Předmět: | |
| Zdroj: | Physical Review B 107, L100505 (2023) |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1103/PhysRevB.107.L100505 |
| Popis: | Electronic nematicity, a consequence of rotational symmetry breaking, is an emergent phenomenon in various new materials. In order to fully utilize the functions of these materials, ability of tuning them through a knob, the nematic director, is desired. Here we report a successful manipulation of the nematic director, the vector order-parameter (d-vector), in the spin-triplet superconducting state of CuxBi2Se3 by magnetic fields. At H = 0.5 T, the ac susceptibility related to the upper critical field shows a two-fold symmetry in the basal plane. At H = 1.5 T, however, the susceptibility shows a six-fold symmetry, which has never been reported before in any superconductor. These results indicate that the d-vector initially pinned to a certain direction is unlocked by a threshold field to respect the trigonal crystal symmetry. We further reveal that the superconducting gap in different crystals converges to p_x symmetry at high fields, although it differs at low fields. Comment: Errors in figures corrected. Published version |
| Databáze: | arXiv |
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