Jureczko, Paulina and Hanis, Jozef and Faria Junior, Paulo E. and Gmitra, Martin and Kurpas, Marcin (2024) Probing type-II Ising pairing using the spin-mixing parameter. PHYSICAL REVIEW B, 109 (16): 165428. ISSN 2469-9950, 2469-9969
Full text not available from this repository. (Request a copy)Abstract
The immunity of Ising superconductors to external magnetic fields originates from a spin locking of the paired electrons to an intrinsic Zeeman-like field. The spin-momentum locking in non-centrosymmetric crystalline materials leads to type-I Ising pairing in which the direction of the intrinsic field can be deduced from the spin expectation values. Conversely, in centrosymmetric crystals the electron spins locked to the orbitals can form Ising type-II pairs consisting of spin-orbit split doublets. Due to time-reversal symmetry, the doublets are spin degenerate, making it difficult to read the spin polarization of bands and the direction of spin-orbit fields. Here we present an efficient approach to determine the direction of the intrinsic field using the spin-mixing parameter b2. Using first-principles calculations based on the density functional theory, we study monolayer transition metal dichalcogenide superconductors PdTe2, NbTe2, and TiSe2 with the 1T structure. We calculate b2 for individual Fermi pockets and provide a general picture of possible Ising type-II pairing within the full Brillouin zone. To complement our first-principles results, we use group theory to provide a detailed picture of spin-orbit coupling and spin mixing in the relevant bands forming Fermi pockets. We demonstrate that contrary to the anticipated effects of spin-orbit locking, not every spin-orbit split spin doublet actively participates in Ising pairing. Finally, by connecting the spin-mixing parameter b2 with the intrinsic out-of-plane Zeeman field, we estimate the upper in-plane critical magnetic field.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | CRITICAL FIELD; SUPERCONDUCTIVITY; |
| Subjects: | 500 Science > 530 Physics |
| Divisions: | Physics > Institute of Theroretical Physics > Chair Professor Richter > Group Jaroslav Fabian |
| Depositing User: | Dr. Gernot Deinzer |
| Date Deposited: | 04 Nov 2025 07:41 |
| Last Modified: | 04 Nov 2025 07:41 |
| URI: | https://pred.uni-regensburg.de/id/eprint/64913 |
Actions (login required)
 |
View Item |
