Thermodynamic Identification of the Internal Superconducting Phase Boundary in UTe$_2$ for $H \parallel b$
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arXiv
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| Format: | Preprint |
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2026
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| _version_ | 1866918472112406528 |
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| author | Vališka, Michal Haidamak, Tetiana Cabala, Andrej Proschek, Petr Hausprug, Andreas Zherlitsyn, Sergei Sechovský, Vladimír |
| author_facet | Vališka, Michal Haidamak, Tetiana Cabala, Andrej Proschek, Petr Hausprug, Andreas Zherlitsyn, Sergei Sechovský, Vladimír |
| contents | The $H$--$T$ phase diagram of UTe$_2$ for magnetic field along the hard $b$ axis contains an unresolved internal boundary near $μ_0H \sim 14$--15~T, previously inferred from ac susceptibility and transport experiments but lacking thermodynamic evidence. We report ultrasound results for several elastic modes in an ultraclean UTe$_2$ single crystal with $T_c>2$~K for $H \parallel b$ down to 0.33~K and up to 18~T. A pronounced anomaly in the longitudinal $C_{33}$ mode, with a weaker response in $C_{44}$ and no resolvable anomaly in $C_{55}$, establishes this feature as a bulk thermodynamic phase boundary and reveals a symmetry-selective coupling to lattice strain. The phase line remains nearly constant in field near 14~T and terminates near 13.5~T and 1.25~K at a tetracritical point, providing the thermodynamic evidence for the fourth phase boundary in the $H$--$T$ phase diagram. The results constrain the order-parameter structure of the high-field phase and support field-induced multicomponent superconductivity in UTe$_2$. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2604_25896 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Thermodynamic Identification of the Internal Superconducting Phase Boundary in UTe$_2$ for $H \parallel b$ Vališka, Michal Haidamak, Tetiana Cabala, Andrej Proschek, Petr Hausprug, Andreas Zherlitsyn, Sergei Sechovský, Vladimír Superconductivity Strongly Correlated Electrons The $H$--$T$ phase diagram of UTe$_2$ for magnetic field along the hard $b$ axis contains an unresolved internal boundary near $μ_0H \sim 14$--15~T, previously inferred from ac susceptibility and transport experiments but lacking thermodynamic evidence. We report ultrasound results for several elastic modes in an ultraclean UTe$_2$ single crystal with $T_c>2$~K for $H \parallel b$ down to 0.33~K and up to 18~T. A pronounced anomaly in the longitudinal $C_{33}$ mode, with a weaker response in $C_{44}$ and no resolvable anomaly in $C_{55}$, establishes this feature as a bulk thermodynamic phase boundary and reveals a symmetry-selective coupling to lattice strain. The phase line remains nearly constant in field near 14~T and terminates near 13.5~T and 1.25~K at a tetracritical point, providing the thermodynamic evidence for the fourth phase boundary in the $H$--$T$ phase diagram. The results constrain the order-parameter structure of the high-field phase and support field-induced multicomponent superconductivity in UTe$_2$. |
| title | Thermodynamic Identification of the Internal Superconducting Phase Boundary in UTe$_2$ for $H \parallel b$ |
| topic | Superconductivity Strongly Correlated Electrons |
| url | https://arxiv.org/abs/2604.25896 |