High-Field Superconducting Halo in UTe$_2$
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arXiv
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2024
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| author | Lewin, Sylvia K. Czajka, Peter Frank, Corey E. Salas, Gicela Saucedo Yoon, Hyeok Eo, Yun Suk Paglione, Johnpierre Nevidomskyy, Andriy H. Singleton, John Butch, Nicholas P. |
| author_facet | Lewin, Sylvia K. Czajka, Peter Frank, Corey E. Salas, Gicela Saucedo Yoon, Hyeok Eo, Yun Suk Paglione, Johnpierre Nevidomskyy, Andriy H. Singleton, John Butch, Nicholas P. |
| contents | Heavy fermion UTe$_2$ is a promising candidate for topological superconductivity that also exhibits multiple high-field superconducting phases. The SC$_{\rm{FP}}$ phase has only been observed in off-axis magnetic fields in the $bc$ plane at fields greater than 40 teslas, a striking scale given its critical temperature of only 2 kelvins. Here, we extend measurements of this unique superconducting state outside of the $bc$ plane and reveal its core structure. The SC$_{\rm{FP}}$ phase is not confined to fields in the $bc$ plane and in fact wraps around the $b$ axis in a halo-like fashion. In other words, this superconducting state, which exists in fields above 73 teslas, is stabilized by a field component perpendicular to the magnetic easy axis. These remarkable field scales further underscore UTe$_2$'s unique magnetophilic superconducting tendencies and suggest an underlying pairing mechanism that is qualitatively distinct from known theories for field-enhanced superconductivity. Phenomenological modeling points to a two-component, non-unitary spin triplet order parameter with finite orbital momentum of the Cooper pairs as a natural explanation for the field-angle dependence of the upper critical field of the SC$_{\rm{FP}}$ phase. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2402_18564 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | High-Field Superconducting Halo in UTe$_2$ Lewin, Sylvia K. Czajka, Peter Frank, Corey E. Salas, Gicela Saucedo Yoon, Hyeok Eo, Yun Suk Paglione, Johnpierre Nevidomskyy, Andriy H. Singleton, John Butch, Nicholas P. Superconductivity Heavy fermion UTe$_2$ is a promising candidate for topological superconductivity that also exhibits multiple high-field superconducting phases. The SC$_{\rm{FP}}$ phase has only been observed in off-axis magnetic fields in the $bc$ plane at fields greater than 40 teslas, a striking scale given its critical temperature of only 2 kelvins. Here, we extend measurements of this unique superconducting state outside of the $bc$ plane and reveal its core structure. The SC$_{\rm{FP}}$ phase is not confined to fields in the $bc$ plane and in fact wraps around the $b$ axis in a halo-like fashion. In other words, this superconducting state, which exists in fields above 73 teslas, is stabilized by a field component perpendicular to the magnetic easy axis. These remarkable field scales further underscore UTe$_2$'s unique magnetophilic superconducting tendencies and suggest an underlying pairing mechanism that is qualitatively distinct from known theories for field-enhanced superconductivity. Phenomenological modeling points to a two-component, non-unitary spin triplet order parameter with finite orbital momentum of the Cooper pairs as a natural explanation for the field-angle dependence of the upper critical field of the SC$_{\rm{FP}}$ phase. |
| title | High-Field Superconducting Halo in UTe$_2$ |
| topic | Superconductivity |
| url | https://arxiv.org/abs/2402.18564 |