Low-temperature anomaly and anisotropy of critical magnetic fields in transition-metal dichalcogenide superconductors
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| Main Authors: | , , , |
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| Format: | Preprint |
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2026
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| _version_ | 1866917368014307328 |
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| author | Sano, Tomoya Tabata, Kota Sasaki, Akihiro Asano, Yasuhiro |
| author_facet | Sano, Tomoya Tabata, Kota Sasaki, Akihiro Asano, Yasuhiro |
| contents | We clarify why spin-singlet superconductivity persists in monolayer transition-metal dichalcogenides even in high magnetic fields beyond the Pauli limit. The phenomenon called Ising protection is caused by two magnetically active potentials: a Zeeman field and an Ising spin-orbit interaction. These potentials induce two spin-triplet pairing correlations in a spin-singlet superconductor. One belonging to odd-frequency symmetry class arises solely from a Zeeman field and always makes the superconducting state unstable. The other belonging to even-frequency symmetry class arise from the interaction between the two magnetic potentials and eliminate the instability caused by odd-frequency pairs. The presence or absence of even-frequency spin-triplet pairs explains the anisotropy of the Ising protection. The analytical expression of the superfluid weight enables us to conclude that even-frequency spin-triplet Cooper pairs support spin-singlet superconductivity in high Zeeman fields. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2601_20288 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Low-temperature anomaly and anisotropy of critical magnetic fields in transition-metal dichalcogenide superconductors Sano, Tomoya Tabata, Kota Sasaki, Akihiro Asano, Yasuhiro Superconductivity We clarify why spin-singlet superconductivity persists in monolayer transition-metal dichalcogenides even in high magnetic fields beyond the Pauli limit. The phenomenon called Ising protection is caused by two magnetically active potentials: a Zeeman field and an Ising spin-orbit interaction. These potentials induce two spin-triplet pairing correlations in a spin-singlet superconductor. One belonging to odd-frequency symmetry class arises solely from a Zeeman field and always makes the superconducting state unstable. The other belonging to even-frequency symmetry class arise from the interaction between the two magnetic potentials and eliminate the instability caused by odd-frequency pairs. The presence or absence of even-frequency spin-triplet pairs explains the anisotropy of the Ising protection. The analytical expression of the superfluid weight enables us to conclude that even-frequency spin-triplet Cooper pairs support spin-singlet superconductivity in high Zeeman fields. |
| title | Low-temperature anomaly and anisotropy of critical magnetic fields in transition-metal dichalcogenide superconductors |
| topic | Superconductivity |
| url | https://arxiv.org/abs/2601.20288 |