تقرير
Evidence for Pseudogap Phase in Cerium Superhydrides: CeH$_{10}$ and CeH$_9$
| العنوان: | Evidence for Pseudogap Phase in Cerium Superhydrides: CeH$_{10}$ and CeH$_9$ |
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| المؤلفون: | Semenok, Dmitrii, Guo, Jianning, Zhou, Di, Chen, Wuhao, Helm, Toni, Kvashnin, Alexander, Sadakov, Andrei, Sobolevsky, Oleg, Pudalov, Vladimir, Xi, Chuanying, Huang, Xiaoli, Troyan, Ivan |
| سنة النشر: | 2023 |
| المجموعة: | Condensed Matter |
| مصطلحات موضوعية: | Condensed Matter - Superconductivity, Condensed Matter - Materials Science |
| الوصف: | Polyhydride superconductors have been shown to possess metallic properties with a Bardeen-Cooper-Schrieffer-type superconducting ground state. Here, we provide evidence for unconventional transport associated with a pseudogap phase in cubic cerium superhydride CeH$_{10}$ ($\textit{T}$$_C$ = 116 K) at pressure of 115-125 GPa. A large negative magnetoresistance in the non-superconducting state below 90 K, quasi $\textit{T}$-linear electrical resistance, and a sign-change of its temperature dependence mark the emergence of this phase. We studied the magnetic phase diagrams and the upper critical fields $\textit{B}$$_{C2}$(T) of CeH$_{10}$, CeH$_9$, and CeD$_9$ in pulsed fields up to 70 T. $\textit{B}$$_{C2}$(T) of CeH$_9$ and CeD$_9$ exhibits pronounced saturation at low temperatures in accordance with the Werthamer-Helfand-Hohenberg model, whereas CeH$_{10}$ stands out in particular, as it does not obey this model. Our observations, therefore, reveal the unconventional nature of non-superconducting state of cerium superhydride CeH$_{10}$. Comment: The discussion part has been improved |
| نوع الوثيقة: | Working Paper |
| URL الوصول: | http://arxiv.org/abs/2307.11742 |
| رقم الأكسشن: | edsarx.2307.11742 |
| قاعدة البيانات: | arXiv |
| الوصف غير متاح. |