Superconductivity in solid benzene molecular crystal

Zhong, Guo‐Hua; Yang, Chunlei; Chen, Xiao‐Jia; Lin, Hai‐Qing

doi:10.1088/1361-648x/aac3ff

Cited by 10 publications

(10 citation statements)

References 46 publications

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“…These unknown peaks are possibly induced by graphite, C 60 , and other modes. , On the one hand, therefore, we infer that the two higher transition temperatures may be from other new superconducting modes such as CK x , KH x , and K–CH x compounds induced by the reconstruction. On the other hand, as in our previous studies, , some internal and external factors can be the cause of high superconducting transition temperature, such as electronic correlations and pressure. The strong electronic correlations in K-doped p -terphenyl were implied by Baskaran and Fabrizio et al In this kind of low-dimensional organic system, therefore, the high superconductivity may be related with the electronic correlational effects.…”

Section: Resultssupporting

confidence: 66%

“…However, previous theoretical studies showed that PAH superconductors usually exhibit the antiferromagnetic (AFM) ground state − and exist the strong electronic correlation effects, − indicating that the superconducting mechanism is complicated in aromatic hydrocarbons. Our theoretical predictions have argued that electronic correlations or pressure could enhance high T c in aromatic hydrocarbons. Hence, organic-based compounds are candidates of high temperature or room temperature superconductors because the interaction of electrons with much higher excitation energy than the phonon energy can result in a substantially higher T c in these low-dimensional materials. , Thus, the higher T c can be expected in this kind of aromatic hydrocarbons.…”

Section: Introductionmentioning

confidence: 80%

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Structural and Bonding Characteristics of Potassium-Doped p-Terphenyl Superconductors

Zhong

Wang

et al. 2018

J. Phys. Chem. C

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Recently, there is a series of reports by Wang et al. on the superconductivity in K-doped pterphenyl (KxC18H14) with the transition temperatures range from 7 to 123 Kelvin. Identifying the structural and bonding character is the key to understand the superconducting phases and the related properties. Therefore we carried out an extensive study on the crystal structures with different doping levels and investigate the thermodynamic stability, structural, electronic, and magnetic properties by the first-principles calculations. Our calculated structures capture most features of the experimentally observed X-ray diffraction patterns. The K doping concentration is constrained to within the range of 2 and 3. The obtained formation energy indicates that the system at x = 2.5 is more stable. The strong ionic bonding interaction is found in between K atoms and organic molecules. The charge transfer accounts for the metallic feature of the doped materials. For a small amount of charge transferred, the tilting force between the two successive benzenes drives the system to stabilize at the antiferromagnetic ground state, while the system exhibits non-magnetic behavior with increasing charge transfer. The multiformity of band structures near the Fermi level indicates that the driving force for superconductivity is complicated.

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Section: Resultssupporting

confidence: 66%

Section: Introductionmentioning

confidence: 80%

Structural and Bonding Characteristics of Potassium-Doped p-Terphenyl Superconductors

Zhong

Wang

et al. 2018

J. Phys. Chem. C

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“…Candidate PAH molecules with small Δ and a similar stacking type to those for the reported superconductors are listed in Figure c. Among the final 10 candidates, phenanthrene (1), picene (2), and coronene (8) are the experimentally reported superconductors, and benzene (7) was theoretically predicted to be a superconductor under high pressure . Note that triphenylene (3) was confirmed to be a superconductor by doping sodium in this work.…”

Section: Results and Discussionmentioning

confidence: 77%

Discovery of Sodium-Doped Triphenylene Superconductors by Searching the Organic Material Database

et al. 2020

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Over the past few decades, there has been a lot of research on organic molecule-based materials for future advanced technology. The superconductivity has also been reported in various carbon-based organic materials in line with this trend. In particular, polycyclic aromatic hydrocarbons (PAHs) have been intensively studied in recent years because of the highly conjugated characteristics of the delocalized electrons supplied by alkali metal doping. Here, we report on a PAH superconductor, sodium-doped triphenylene (nominal composition of Na 3 triphenylene), which was discovered by searching the database of PAH molecules with a small energy difference between the lowest unoccupied molecular orbital (LUMO) and LUMO + 1 states. As the first sodium-doped PAH superconductor, it shows the superconducting transition at T c ≈ 15 K under ambient pressure. The discovery of the new PAH superconductor suggests the promising possibility of superconductivity from more diverse molecular structures and the realization of high-T c organic superconductors furthermore.

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“…4 (b) and (c)) induced by pressure. The pressure-induced phonon soening is a common behavior of superconductors at high pressure, [35][36][37] and it plays a crucial role in enhancing the electron-phonon coupling. 1,38,39 Therefore, the l of phase-b increases with the pressure increasing, which counteracts the decrease of u log .…”

Section: Resultsmentioning

confidence: 99%