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| Format: | Preprint |
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2023
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| Online-Zugang: | https://arxiv.org/abs/2312.10886 |
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| _version_ | 1866911316933869568 |
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| author | Haruna, Shingo Nomura, Takuji Kaneyasu, Hirono |
| author_facet | Haruna, Shingo Nomura, Takuji Kaneyasu, Hirono |
| contents | We explore the pairing state and gap structure of UTe$_2$ using a six-orbital model which we call the $f$-$d$-$p$ model. Our model accurately reproduces the quasi-two-dimensional Fermi surfaces consistent with recent de Haas-van Alphen oscillation measurements and the $(0, \pm π, 0)$ antiferromagnetic spin fluctuations observed by neutron scattering. We incorporate on-site Coulomb repulsion for $f$ electrons and solve the linearized Eliashberg equation within the third-order perturbation theory to investigate the superconducting symmetry in UTe$_2$. The most likely state is found to be an $s$-wave state with a highly anisotropic superconducting gap structure that exhibits a point-node-like behavior of the specific heat at low temperatures. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2312_10886 |
| institution | arXiv |
| publishDate | 2023 |
| record_format | arxiv |
| spellingShingle | Unconventional $s$-Wave Pairing with Point-Node-Like Gap Structure in UTe$_2$ Haruna, Shingo Nomura, Takuji Kaneyasu, Hirono Superconductivity Strongly Correlated Electrons We explore the pairing state and gap structure of UTe$_2$ using a six-orbital model which we call the $f$-$d$-$p$ model. Our model accurately reproduces the quasi-two-dimensional Fermi surfaces consistent with recent de Haas-van Alphen oscillation measurements and the $(0, \pm π, 0)$ antiferromagnetic spin fluctuations observed by neutron scattering. We incorporate on-site Coulomb repulsion for $f$ electrons and solve the linearized Eliashberg equation within the third-order perturbation theory to investigate the superconducting symmetry in UTe$_2$. The most likely state is found to be an $s$-wave state with a highly anisotropic superconducting gap structure that exhibits a point-node-like behavior of the specific heat at low temperatures. |
| title | Unconventional $s$-Wave Pairing with Point-Node-Like Gap Structure in UTe$_2$ |
| topic | Superconductivity Strongly Correlated Electrons |
| url | https://arxiv.org/abs/2312.10886 |