Evidence for Pseudogap Phase in Cerium Superhydrides: CeH$_{10}$ and CeH$_9$
2023
Online
report
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
Titel: |
Evidence for Pseudogap Phase in Cerium Superhydrides: CeH$_{10}$ and CeH$_9$
|
---|---|
Autor/in / Beteiligte Person: | Semenok, Dmitrii ; Guo, Jianning ; Zhou, Di ; Chen, Wuhao ; Helm, Toni ; Kvashnin, Alexander ; Sadakov, Andrei ; Sobolevsky, Oleg ; Pudalov, Vladimir ; Xi, Chuanying ; Huang, Xiaoli ; Troyan, Ivan |
Link: | |
Veröffentlichung: | 2023 |
Medientyp: | report |
Schlagwort: |
|
Sonstiges: |
|