Competing electronic ground states in the heavy-fermion superconductor CeRh2As2
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| Main Authors: | , , , , , , |
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| Format: | Preprint |
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2024
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| _version_ | 1866912168890335232 |
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| author | Bławat, Joanna Chajewski, Grzegorz Gnida, Daniel Singleton, John Valenzuela, Oscar Ayala Kaczorowski, Dariusz McDonald, Ross D. |
| author_facet | Bławat, Joanna Chajewski, Grzegorz Gnida, Daniel Singleton, John Valenzuela, Oscar Ayala Kaczorowski, Dariusz McDonald, Ross D. |
| contents | CeRh2As2 is rare among superconductors, in that magnetic field tunes it between two distinct superconducting phases. Combined with a lack of local inversion symmetry and an upper critical field exceeding the Pauli paramagnetic limit, this excitingly suggests triplet multicomponent superconductivity. Preceding the superconducting onset, f-electron correlations cause long-range order, attributed both to local antiferromagnetism and itinerant (quadrupole) density-waves. Magnetic field provides a significant perturbation of the f-electron and may reveal the nature of the many-body correlations. Thus, we report comprehensive magnetization and magnetotransport studies on microstructured devices in fields of up to 73 T. Applied along the c-axis, field causes a low-temperature valence transition at μ0H ~ 24 T. By contrast, in-plane fields produce a cascade of phase transitions; the field-induced in-plane conductivity anisotropy and lack of accompanying magnetic features, plus the closed-dome nature of the overall phase boundary is consistent with a hierarchy of field-induced density-wave states. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2412_18068 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Competing electronic ground states in the heavy-fermion superconductor CeRh2As2 Bławat, Joanna Chajewski, Grzegorz Gnida, Daniel Singleton, John Valenzuela, Oscar Ayala Kaczorowski, Dariusz McDonald, Ross D. Strongly Correlated Electrons Materials Science CeRh2As2 is rare among superconductors, in that magnetic field tunes it between two distinct superconducting phases. Combined with a lack of local inversion symmetry and an upper critical field exceeding the Pauli paramagnetic limit, this excitingly suggests triplet multicomponent superconductivity. Preceding the superconducting onset, f-electron correlations cause long-range order, attributed both to local antiferromagnetism and itinerant (quadrupole) density-waves. Magnetic field provides a significant perturbation of the f-electron and may reveal the nature of the many-body correlations. Thus, we report comprehensive magnetization and magnetotransport studies on microstructured devices in fields of up to 73 T. Applied along the c-axis, field causes a low-temperature valence transition at μ0H ~ 24 T. By contrast, in-plane fields produce a cascade of phase transitions; the field-induced in-plane conductivity anisotropy and lack of accompanying magnetic features, plus the closed-dome nature of the overall phase boundary is consistent with a hierarchy of field-induced density-wave states. |
| title | Competing electronic ground states in the heavy-fermion superconductor CeRh2As2 |
| topic | Strongly Correlated Electrons Materials Science |
| url | https://arxiv.org/abs/2412.18068 |