High-Temperature Superconducting Phases in Cerium Superhydride with a 
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 up to 115 K below a Pressure of 1 Megabar

Chen, Wuhao; Semenok, Dmitrii V.; Huang, Xiaoli; Shu, Haiyun; Li, Xin; Duan, Defang; Cui, Tian; Oganov, Artem R.

doi:10.1103/physrevlett.127.117001

Cited by 167 publications

(104 citation statements)

References 70 publications

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“…Amongst these, CeH x , to date, has the highest S value as 1.12 below 100 GPa (Figure 1). The isotope effects were also experimentally observed in D 2 S [8], YD 6 [14], LaD 10 [9], and CeD 9 [18]. These experimental results (see Figure 1) have confirmed theoretical predictions for the basic structures and superconducting properties [25][26][27][28][29][30][31][32][33][34][35][36][37][38][39][40], thereby starting a new era for exploring the ambient condition superconductivity.…”

Section: Introductionsupporting

confidence: 73%

“…This idea has driven subsequent efforts on studying the hydrides, eventually leading to the discovery of superconductivity above 200 K, first in H 3 S (T c of 203 K) [8] and more recently in LaH 10 (T c up to 260 K) [9,10] and a carbonaceous sulfur hydride (CSH) (T c of 288 K) [11]. Since 2015, superconductivity has been reported in the following compounds at high pressure: PH x above 100 K under 207 GPa [12], YH x at 243 K above 200 GPa [13,14], ThH x at 161 K under 175 GPa [15], PrH x at 9 K under 130 GPa [16], LaYH x at 253 K under 183 GPa [17], CeH x at 115-120 K under 95 GPa [18], SnH x at 70 K under 200 GPa [19], BaH x around 20 K under 140 GPa [20], CaH x at 215 K under 172 GPa [21], ScH x at 22.4 K under 156 GPa, and LuH x at 15 K under 128 GPa [22]. The experiment conditions and results are summarized in the Table 1.…”

Section: Introductionmentioning

confidence: 99%

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Future Study of Dense Superconducting Hydrides at High Pressure

2021

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The discovery of a record high superconducting transition temperature (Tc) of 288 K in a pressurized hydride inspires new hope to realize ambient-condition superconductivity. Here, we give a perspective on the theoretical and experimental studies of hydride superconductivity. Predictions based on the BCS–Eliashberg–Midgal theory with the aid of density functional theory have been playing a leading role in the research and guiding the experimental realizations. To date, about twenty hydrides experiments have been reported to exhibit high-Tc superconductivity and their Tc agree well with the predicted values. However, there are still some controversies existing between the predictions and experiments, such as no significant transition temperature broadening observed in the magnetic field, the experimental electron-phonon coupling beyond the Eliashberg–Midgal limit, and the energy dependence of density of states around the Fermi level. To investigate these controversies and the origin of the highest Tc in hydrides, key experiments are required to determine the structure, bonding, and vibrational properties associated with H atoms in these hydrides.

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Section: Introductionsupporting

confidence: 73%

Section: Introductionmentioning

confidence: 99%

Future Study of Dense Superconducting Hydrides at High Pressure

2021

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“…The focus of the field is gradually shifting from achieving ever larger T c 's to finding new high-T c materials which can operate at (or close to) ambient pressure. Migdal-Eliashberg theory for superconductivity suggests that, besides hydrides [11,12], obvious candidates for observing high-T c superconductivity from conventional (electron-phonon, hereafter e-ph ) interaction are light-element compounds. In particular, boron and/or carbon compounds combine large phonon frequencies and covalent bonds, the two most important ingredients underlying high-T c (conventional) superconductivity [13][14][15].…”

Section: Introductionmentioning

confidence: 99%

High- Tc superconductivity in doped boron-carbon clathrates

et al. 2022

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We report a high-throughput ab initio study of the thermodynamic and superconducting properties of the recently synthesized X B 3 C 3 clathrates. These compounds, in which boron and carbon form a spongelike network of interconnected cages each enclosing a central X atom, are attractive candidates to achieve high-T c conventional superconductivity at ambient pressure, due to the simultaneous presence of a stiff B-C covalent network and a tunable Fermi energy due to the X atom acting as a charge reservoir. Ternary compounds like CaB 3 C 3 , SrB 3 C 3 , and BaB 3 C 3 are predicted to exhibit T c 50 K at moderate or ambient pressures, which may further increase up to 77 K if the original compounds are hole doped, by replacing the divalent alkaline earth with a monovalent alkali metal to form an ordered XY B 6 C 6 alloy.

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“…[7][8][9] Therefore, the preparation of high-T c superconductors at a lower pressure or ambient pressure is of fundamental importance. 10,11 The graphene-like motif is of great interest due to the planar atomic arrangement, sp 2 hybridized feature, and intriguing properties. [12][13][14] For instance, graphene, the first two-dimensional material, shows many new attributes that are not observed in bulk materials, and is regarded as a revolutionary material in the 21st century.…”

Section: Introductionmentioning

confidence: 99%