Spin-Triplet Superconductivity Induced by All-In-All-Out Spin Fluctuation in Pyrochlore Electronic System
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arXiv
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| Format: | Preprint |
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2024
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| _version_ | 1866910511310831616 |
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| author | Sumiyoshiya, Akiho Takimoto, Tetsuya |
| author_facet | Sumiyoshiya, Akiho Takimoto, Tetsuya |
| contents | We study the symmetry of superconductivity around the All-In-All-Out (AIAO) spin ordered phase in a nearly half-filled pyrochlore electronic system. The electronic system is described by the Hubbard model with an anti-symmetric spin-orbit coupling. The AIAO spin ordered state is formed by arranging tetrahedral hedgehog spin-clusters uniformly in the lattice system, where 12 types of spin-clusters are allowed in a unit cell. All spin-cluster susceptibilities are calculated within the random phase approximation with respect to the onsite electron interaction. It is shown that, for the negative spin-orbit coupling coefficient, the AIAO spin-cluster susceptibility diverges at q=0, while other types of spin-cluster susceptibilities are not developed and are structureless. By calculating the superconducting transition mediated by AIAO spin fluctuation, it is found that a spin-triplet superconductivity appears, while there is no signal of superconducting transition for the spin-singlet one. We suggest that the spin-triplet superconductivity appears around the AIAO spin ordered phase in the pyrochlore lattice. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2407_02865 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Spin-Triplet Superconductivity Induced by All-In-All-Out Spin Fluctuation in Pyrochlore Electronic System Sumiyoshiya, Akiho Takimoto, Tetsuya Strongly Correlated Electrons Superconductivity We study the symmetry of superconductivity around the All-In-All-Out (AIAO) spin ordered phase in a nearly half-filled pyrochlore electronic system. The electronic system is described by the Hubbard model with an anti-symmetric spin-orbit coupling. The AIAO spin ordered state is formed by arranging tetrahedral hedgehog spin-clusters uniformly in the lattice system, where 12 types of spin-clusters are allowed in a unit cell. All spin-cluster susceptibilities are calculated within the random phase approximation with respect to the onsite electron interaction. It is shown that, for the negative spin-orbit coupling coefficient, the AIAO spin-cluster susceptibility diverges at q=0, while other types of spin-cluster susceptibilities are not developed and are structureless. By calculating the superconducting transition mediated by AIAO spin fluctuation, it is found that a spin-triplet superconductivity appears, while there is no signal of superconducting transition for the spin-singlet one. We suggest that the spin-triplet superconductivity appears around the AIAO spin ordered phase in the pyrochlore lattice. |
| title | Spin-Triplet Superconductivity Induced by All-In-All-Out Spin Fluctuation in Pyrochlore Electronic System |
| topic | Strongly Correlated Electrons Superconductivity |
| url | https://arxiv.org/abs/2407.02865 |