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| Main Authors: | , , , , , , , , , , , , |
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| Format: | Preprint |
| Published: |
2024
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| Subjects: | |
| Online Access: | https://arxiv.org/abs/2406.03566 |
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| _version_ | 1866929620877574144 |
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| author | Chen, Tong Siddiquee, Hasan Rehfuss, Zack Gao, Shiyuan Lygouras, Chris Drouin, Jack Morano, Vincent Avers, Keenan E. Schmitt, Christopher J. Podlesnyak, Andrey Ran, Sheng Song, Yu Broholm, Collin |
| author_facet | Chen, Tong Siddiquee, Hasan Rehfuss, Zack Gao, Shiyuan Lygouras, Chris Drouin, Jack Morano, Vincent Avers, Keenan E. Schmitt, Christopher J. Podlesnyak, Andrey Ran, Sheng Song, Yu Broholm, Collin |
| contents | The tetragonal heavy-fermion superconductor CeRh$_2$As$_2$ ($T_{\rm c}=0.3$ K) exhibits an exceptionally high critical field of 14 T for $\textbf{B} \parallel \textbf{c}$. It undergoes a field-driven first-order phase transition between superconducting (SC) states, potentially transitioning from spin-singlet to spin-triplet superconductivity. To elucidate the underlying pairing mechanism, we probe spin fluctuations in CeRh$_2$As$_2$ using neutron scattering. We find dynamic $(π,π)$ antiferromagnetic spin correlations with an anisotropic quasi-two-dimensional correlation volume. Our data place an upper limit of 0.31 $μ_{\rm B}$ on the staggered magnetization of corresponding Néel orders at $T=0.08$ K. Density functional theory (DFT) calculations, treating Ce $4f$ electrons as core states, show that the AFM wave vector connects significant areas of the Fermi surface. Our findings show the dominant excitations in CeRh$_2$As$_2$ for $\hbarω< 1.2$~meV are magnetic and indicate superconductivity in CeRh$_2$As$_2$ is mediated by AFM spin fluctuations associated with a proximate quantum critical point. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2406_03566 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Quasi-two-dimensional Antiferromagnetic Spin Fluctuations in the Spin-triplet Superconductor Candidate CeRh$_2$As$_2$ Chen, Tong Siddiquee, Hasan Rehfuss, Zack Gao, Shiyuan Lygouras, Chris Drouin, Jack Morano, Vincent Avers, Keenan E. Schmitt, Christopher J. Podlesnyak, Andrey Ran, Sheng Song, Yu Broholm, Collin Strongly Correlated Electrons Superconductivity The tetragonal heavy-fermion superconductor CeRh$_2$As$_2$ ($T_{\rm c}=0.3$ K) exhibits an exceptionally high critical field of 14 T for $\textbf{B} \parallel \textbf{c}$. It undergoes a field-driven first-order phase transition between superconducting (SC) states, potentially transitioning from spin-singlet to spin-triplet superconductivity. To elucidate the underlying pairing mechanism, we probe spin fluctuations in CeRh$_2$As$_2$ using neutron scattering. We find dynamic $(π,π)$ antiferromagnetic spin correlations with an anisotropic quasi-two-dimensional correlation volume. Our data place an upper limit of 0.31 $μ_{\rm B}$ on the staggered magnetization of corresponding Néel orders at $T=0.08$ K. Density functional theory (DFT) calculations, treating Ce $4f$ electrons as core states, show that the AFM wave vector connects significant areas of the Fermi surface. Our findings show the dominant excitations in CeRh$_2$As$_2$ for $\hbarω< 1.2$~meV are magnetic and indicate superconductivity in CeRh$_2$As$_2$ is mediated by AFM spin fluctuations associated with a proximate quantum critical point. |
| title | Quasi-two-dimensional Antiferromagnetic Spin Fluctuations in the Spin-triplet Superconductor Candidate CeRh$_2$As$_2$ |
| topic | Strongly Correlated Electrons Superconductivity |
| url | https://arxiv.org/abs/2406.03566 |