Hole-Doping Effect on Superconductivity in Compressed CeH$_{9}$ at High Pressure
In: Phys. Rev. B 104, 020504 (2021); (2021)
Online
report
The experimental realization of high-temperature superconductivity in compressed hydrides H$_3$S and LaH$_{10}$ at high pressures over 150 GPa has aroused great interest in reducing the stabilization pressure of superconducting hydrides. For cerium hydride CeH$_9$ recently synthesized at 80$-$100 GPa, our first-principles calculations reveal that the strongly hybridized electronic states of Ce 4$f$ and H 1$s$ orbitals produce the topologically nontrivial Dirac nodal lines around the Fermi energy $E_F$, which are protected by crystalline symmetries. By hole doping, $E_F$ shifts down toward the topology-driven van Hove singularity to significantly increase the density of states, which in turn raises a superconducting transition temperature $T_c$ from 74 K up to 136 K at 100 GPa. The hole-doping concentration can be controlled by the incorporation of Ce$^{3+}$ ions with varying their percentages, which can be well electronically miscible with Ce atoms in the CeH$_9$ matrix because both Ce$^{3+}$ and Ce behave similarly as cations. Therefore, the interplay of symmetry, band topology, and hole doping contributes to enhance $T_c$ in compressed CeH$_9$. This mechanism to enhance $T_c$ can also be applicable to another superconducting rare earth hydride LaH$_{10}$.
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Hole-Doping Effect on Superconductivity in Compressed CeH$_{9}$ at High Pressure
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Autor/in / Beteiligte Person: | Wang, Chongze ; Liu, Shuyuan ; Jeon, Hyunsoo ; Yi, Seho ; Bang, Yunkyu ; Cho, Jun-Hyung |
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Quelle: | Phys. Rev. B 104, 020504 (2021); (2021) |
Veröffentlichung: | 2021 |
Medientyp: | report |
DOI: | 10.1103/PhysRevB.104.L020504 |
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