Saved in:
| Main Authors: | , , , , , , , , , |
|---|---|
| Format: | Preprint |
| Published: |
2023
|
| Subjects: | |
| Online Access: | https://arxiv.org/abs/2307.13067 |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| _version_ | 1866910432693846016 |
|---|---|
| author | Guo, Jianning Semenok, Dmitrii Shutov, Grigoriy Zhou, Di Chen, Su Wang, Yulong Helm, Toni Luther, Sven Huang, Xiaoli Cui, Tian |
| author_facet | Guo, Jianning Semenok, Dmitrii Shutov, Grigoriy Zhou, Di Chen, Su Wang, Yulong Helm, Toni Luther, Sven Huang, Xiaoli Cui, Tian |
| contents | High pressure plays a crucial role in the field of superconductivity. Compressed hydride superconductors are leaders in the race for a material that can conduct electricity without resistance at high or even room temperature. In the present work, we have discovered new lanthanum superhydride, cubic A15-type La$_4$H$_{23}$, with lower stabilization pressure compared to the reported $\textit{fcc}$ LaH$_{10}$. Superconducting La$_4$H$_{23}$ was obtained by laser heating of LaH$_3$ with ammonia borane at about 120 GPa. Transport measurements reveal the maximum critical temperature $\textit{T}$$_{C}$(onset) = 105 K and the critical field $\textit{H}$$_{C2}$(0) = 32 T at 118 GPa, as evidenced by the sharp drop of electrical resistance and the displacement of superconducting transitions in applied magnetic fields. Moreover, we provide evidence for unconventional transport associated with a pseudogap phase in La$_4$H$_{23}$ using pulsed magnetic fields up to 68 T. A large negative magnetoresistance in the non-superconducting state below 40 K, quasi $\textit{T}$-linear electrical resistance, and a sign-change of its temperature dependence mark the emergence of pseudogap in this hydride. Discovered lanthanum hydride is a new member of the A15 family of superconductors with $\textit{T}$$_C$ exceeding the boiling point of liquid nitrogen. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2307_13067 |
| institution | arXiv |
| publishDate | 2023 |
| record_format | arxiv |
| spellingShingle | Large negative magnetoresistance and pseudogap phase in superconducting A15-type La$_4$H$_{23}$ Guo, Jianning Semenok, Dmitrii Shutov, Grigoriy Zhou, Di Chen, Su Wang, Yulong Helm, Toni Luther, Sven Huang, Xiaoli Cui, Tian Superconductivity Materials Science High pressure plays a crucial role in the field of superconductivity. Compressed hydride superconductors are leaders in the race for a material that can conduct electricity without resistance at high or even room temperature. In the present work, we have discovered new lanthanum superhydride, cubic A15-type La$_4$H$_{23}$, with lower stabilization pressure compared to the reported $\textit{fcc}$ LaH$_{10}$. Superconducting La$_4$H$_{23}$ was obtained by laser heating of LaH$_3$ with ammonia borane at about 120 GPa. Transport measurements reveal the maximum critical temperature $\textit{T}$$_{C}$(onset) = 105 K and the critical field $\textit{H}$$_{C2}$(0) = 32 T at 118 GPa, as evidenced by the sharp drop of electrical resistance and the displacement of superconducting transitions in applied magnetic fields. Moreover, we provide evidence for unconventional transport associated with a pseudogap phase in La$_4$H$_{23}$ using pulsed magnetic fields up to 68 T. A large negative magnetoresistance in the non-superconducting state below 40 K, quasi $\textit{T}$-linear electrical resistance, and a sign-change of its temperature dependence mark the emergence of pseudogap in this hydride. Discovered lanthanum hydride is a new member of the A15 family of superconductors with $\textit{T}$$_C$ exceeding the boiling point of liquid nitrogen. |
| title | Large negative magnetoresistance and pseudogap phase in superconducting A15-type La$_4$H$_{23}$ |
| topic | Superconductivity Materials Science |
| url | https://arxiv.org/abs/2307.13067 |