High-Magnetic Field Phases in U$_{1-x}$Th$_x$Te$_2$
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2025
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| author | Moir, Camilla M. Singleton, John Blawat, Joanna Lee-Wong, Eric Deng, Yuhang Feng, Keke Wannamaker, Tyler Baumbach, Ryan E. Maple, M. Brian |
| author_facet | Moir, Camilla M. Singleton, John Blawat, Joanna Lee-Wong, Eric Deng, Yuhang Feng, Keke Wannamaker, Tyler Baumbach, Ryan E. Maple, M. Brian |
| contents | At temperatures much lower than its superconducting critical temperature $T_c$ of 2.1 K, the heavy fermion superconductor UTe$_2$ has a remarkable phase diagram of magnetic field $H$ vs. angles $ϕ$ and $θ$ at which $H$ is tilted away from the $b$-axis toward the $a$- and $c$-axes, respectively, in the orthorhombic unit cell. The phase diagram appears to contain three superconducting phases: (1) a low field superconducting phase SC$_{\mathrm{LF}}$ extending over all values of $ϕ$ and $θ$ with an upper critical field $H_{c2}$ with a maximum value of 15 T at $ϕ= θ= 0^\circ$; (2) a high field superconducting phase SC$_{\mathrm{HF}}$ located in a region between $ϕ\approx 7^\circ$ and $θ\approx 4^\circ$ in fields from $H_{c2\mathrm{LF}}$ of the SC$_{\mathrm{LF}}$ phase and the metamagnetic transition at $H_m$ at $\sim 35$ T marking the onset of the magnetic field polarized FP phase: and (3) a SC$_{\mathrm{FP}}$ superconducting phase that resides entirely within the FP phase in a pocket of superconductivity extending from $θ\approx 20^\circ$ to $40^\circ$ in fields from $\sim 40$ T to above 60 T. In this work, we studied the $H$ vs $θ$ phase diagram at a base temperature of $\sim 0.6$ K as a function of Th concentration $x$ in U$_{1-x}$Th$_x$Te$_2$ pseudobinary compounds for $0.5\% \lesssim x \lesssim 4.7\%$. We find that for all values of $x$ within this range, the SC$_{\mathrm{LF}}$ phase is retained with a reduced value of $H_{c2}$ of $\sim 10$ T at $ϕ= θ= 0^\circ$ for $x = 4.7\%$, while the SC$_{\mathrm{HF}}$ phase is suppressed. The SC$_{\mathrm{FP}}$ and FP phases are unaffected to values of $x = 2\%$ but are completely suppressed in the region $x = 2.5$ to $4.7\%$ where the residual resistance ratio RRR has decreased from $\sim 14$ at $x = 1.5\%$ to values of $\sim 3$, indicating a significant increase in disorder. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2501_08509 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | High-Magnetic Field Phases in U$_{1-x}$Th$_x$Te$_2$ Moir, Camilla M. Singleton, John Blawat, Joanna Lee-Wong, Eric Deng, Yuhang Feng, Keke Wannamaker, Tyler Baumbach, Ryan E. Maple, M. Brian Strongly Correlated Electrons At temperatures much lower than its superconducting critical temperature $T_c$ of 2.1 K, the heavy fermion superconductor UTe$_2$ has a remarkable phase diagram of magnetic field $H$ vs. angles $ϕ$ and $θ$ at which $H$ is tilted away from the $b$-axis toward the $a$- and $c$-axes, respectively, in the orthorhombic unit cell. The phase diagram appears to contain three superconducting phases: (1) a low field superconducting phase SC$_{\mathrm{LF}}$ extending over all values of $ϕ$ and $θ$ with an upper critical field $H_{c2}$ with a maximum value of 15 T at $ϕ= θ= 0^\circ$; (2) a high field superconducting phase SC$_{\mathrm{HF}}$ located in a region between $ϕ\approx 7^\circ$ and $θ\approx 4^\circ$ in fields from $H_{c2\mathrm{LF}}$ of the SC$_{\mathrm{LF}}$ phase and the metamagnetic transition at $H_m$ at $\sim 35$ T marking the onset of the magnetic field polarized FP phase: and (3) a SC$_{\mathrm{FP}}$ superconducting phase that resides entirely within the FP phase in a pocket of superconductivity extending from $θ\approx 20^\circ$ to $40^\circ$ in fields from $\sim 40$ T to above 60 T. In this work, we studied the $H$ vs $θ$ phase diagram at a base temperature of $\sim 0.6$ K as a function of Th concentration $x$ in U$_{1-x}$Th$_x$Te$_2$ pseudobinary compounds for $0.5\% \lesssim x \lesssim 4.7\%$. We find that for all values of $x$ within this range, the SC$_{\mathrm{LF}}$ phase is retained with a reduced value of $H_{c2}$ of $\sim 10$ T at $ϕ= θ= 0^\circ$ for $x = 4.7\%$, while the SC$_{\mathrm{HF}}$ phase is suppressed. The SC$_{\mathrm{FP}}$ and FP phases are unaffected to values of $x = 2\%$ but are completely suppressed in the region $x = 2.5$ to $4.7\%$ where the residual resistance ratio RRR has decreased from $\sim 14$ at $x = 1.5\%$ to values of $\sim 3$, indicating a significant increase in disorder. |
| title | High-Magnetic Field Phases in U$_{1-x}$Th$_x$Te$_2$ |
| topic | Strongly Correlated Electrons |
| url | https://arxiv.org/abs/2501.08509 |