Saved in:
| Main Authors: | , |
|---|---|
| Format: | Preprint |
| Published: |
2025
|
| Subjects: | |
| Online Access: | https://arxiv.org/abs/2509.20672 |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| _version_ | 1866914342831652864 |
|---|---|
| author | Seeyangnok, Jakkapat Pinsook, Udomsilp |
| author_facet | Seeyangnok, Jakkapat Pinsook, Udomsilp |
| contents | Two-dimensional hydrogenated graphene (HC6) represents a promising platform for exploring emergent electronic phases. Owing to its high electronic density of states at the Fermi level, HC6 is expected to support phonon-mediated superconductivity, with a calculated critical temperature Tc of 37.4 K in the paramagnetic metallic phase. However, spin-polarized first-principles calculations reveal that HC6 stabilizes in a ferrimagnetic ground state, which is energetically favored by 0.175 eV per unit cell over the paramagnetic metallic phase. This large energy difference significantly exceeds kB T at room temperature, indicating robust magnetic order. Although the superconducting condensation energy lowers the total energy by about 7 meV, the superconducting phase remains metastable. These results highlight the dominant role of magnetism in HC6 and illustrate how a high electronic density of states can drive competing instabilities in hydrogenated two-dimensional materials, offering design principles for carbon-based magnetic systems. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2509_20672 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Robust Ferrimagnetic Ground State and Suppressed Superconductivity in Two-Dimensional HC6 Seeyangnok, Jakkapat Pinsook, Udomsilp Materials Science Two-dimensional hydrogenated graphene (HC6) represents a promising platform for exploring emergent electronic phases. Owing to its high electronic density of states at the Fermi level, HC6 is expected to support phonon-mediated superconductivity, with a calculated critical temperature Tc of 37.4 K in the paramagnetic metallic phase. However, spin-polarized first-principles calculations reveal that HC6 stabilizes in a ferrimagnetic ground state, which is energetically favored by 0.175 eV per unit cell over the paramagnetic metallic phase. This large energy difference significantly exceeds kB T at room temperature, indicating robust magnetic order. Although the superconducting condensation energy lowers the total energy by about 7 meV, the superconducting phase remains metastable. These results highlight the dominant role of magnetism in HC6 and illustrate how a high electronic density of states can drive competing instabilities in hydrogenated two-dimensional materials, offering design principles for carbon-based magnetic systems. |
| title | Robust Ferrimagnetic Ground State and Suppressed Superconductivity in Two-Dimensional HC6 |
| topic | Materials Science |
| url | https://arxiv.org/abs/2509.20672 |