Superconductivity and phase stability of potassium-doped p-quinquephenyl

Huang, Ge; Zhong, Guo‐Hua; Wang, Ren‐Shu; Han, Jiayu; Lin, Hai‐Qing; Chen, Xiao‐Jia

doi:10.1016/j.carbon.2018.12.001

Cited by 28 publications

(16 citation statements)

References 57 publications

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“…We have investigated the electrical properties of either undoped or K-doped p-terphenyl disks. In undoped pterphenyl, resistivity values confirmed the insulating nature of the pristine material with a ρ RT > 10 16 Ωcm that, in the sensitivity limit of the whole measuring apparatus (instruments, cryogenic cables, etc. ), remained practically constant also at lower T .…”

Section: B Electrical Characterizationmentioning

confidence: 64%

“…While pristine p-terphenyl is electrically insulating, it behaves as a metal upon K-doping 15 . Recent experimental signatures of superconductivity in alkali-doped para-oligophenyl compounds [16][17][18] and in p-terphenyl K x C 18 H 14 [19][20][21][22] in particular, has attracted considerable interest. Increasing the K concentration toward K 3 C 18 H 14 and lowering the temperature, the K-doped p-terphenyl (KPT) shows signatures of superconductivity in the magnetic response, consisting of a weak Meissner shielding effect 21 .…”

Section: Introductionmentioning

confidence: 99%

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Potassium-Doped Para-Terphenyl: Structure, Electrical Transport Properties and Possible Signatures of a Superconducting Transition

et al. 2020

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Preliminary evidence for the occurrence of high-TC superconductivity in alkali-doped organic materials, such as potassium-doped p-terphenyl (KPT), were recently obtained by magnetic susceptibility measurements and by the opening of a large superconducting gap as measured by ARPES and STM techniques. In this work, KPT samples have been synthesized by a chemical method and characterized by low-temperature Raman scattering and resistivity measurements. Here, we report the occurrence of a resistivity drop of more than 4 orders of magnitude at low temperatures in KPT samples in the form of compressed powder. This fact was interpreted as a possible sign of a broad superconducting transition taking place below 90 K in granular KPT. The granular nature of the KPT system appears to be also related to the 20 K broadening of the resistivity drop around the critical temperature.

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Section: B Electrical Characterizationmentioning

confidence: 64%

Section: Introductionmentioning

confidence: 99%

Potassium-Doped Para-Terphenyl: Structure, Electrical Transport Properties and Possible Signatures of a Superconducting Transition

et al. 2020

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“…Based on BCS theory, we can improve the T c by combining the light metal with light‐element hydrides. The mechanism of charge transfer driving the metallization has been proven to be feasible in organic superconductors…”

Section: Conclusion and Future Prospectivementioning

confidence: 99%

Superconductivity of light‐metal hydrides

Chen

Feng

et al. 2019

J Chinese Chemical Soc

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Hydrogen‐rich materials are potential high‐temperature superconductors at pressures lower than metal hydrogen, mainly because hydrogen atoms can provide strong electron–phonon coupling and high phonon frequencies in hydrogen‐rich materials. This review provides a systematic overview of the crystal type, stability, pressure‐induced transition, metallization and superconductivity of binary light‐metal hydrides under high pressure.

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“…Molecular systems based on benzene rings have become important devices that can be used in molecular electronics. They have been characterized with superconducting properties as well as with special characteristics to be used in solar cells, nanotransistors, organic light-emitting diode (OLED), to name a few [ 13 , 14 ]. In particular, the 2,7-Di([1,1′-biphenyl]-4-yl)-9H-fluorene molecule, which is based on benzene rings, is an organic molecule with high potential for various future applications.…”

Section: Introductionmentioning

confidence: 99%

“…In particular, the 2,7-Di([1,1 -biphenyl]-4-yl)-9H-fluorene molecule, which is based on benzene rings, is an organic molecule with high potential for various future applications. It is one of the most promising candidates to act as a Light Emitting Diode (LED); its nanofibers have properties as waveguides and could serve as future nanoscale optical connectors on solid surfaces [15]. However, a new class of aromatic ring molecular nanotransistors based on single-molecule graphene-molecule-graphene junctions was recently reported through the use of an ionic liquid gate and using the hexaphenyl, biphenyl, and terfeline molecules (the hexaphenyl molecule has a similar structure to the 2,7-Di([1,1 -biphenyl]-4-yl)-9H-fluorene molecule).…”

Section: Introductionmentioning

confidence: 99%

Thermo-Electrical Conduction of the 2,7-Di([1,1′-Biphenyl]-4-yl)-9H-Fluorene Molecular System: Coupling between Benzene Rings and Stereoelectronic Effects

2020

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Theoretical and analytical thermal and electrical properties are studied through the 2,7-Di([1,1′-biphenyl]-4-yl)-9H-fluorene aromatic system as a prototype of a molecular switch. Variations of the dihedral angles between the two Benzene rings at each end of the molecule have been considered, thus determining the dependence on the structural variation of the molecule when the aromatic system is connected between metal contacts. The molecule is modeled through a Tight-Binding Hamiltonian where—from the analytical process of decimation and using Green’s functions—the probability of transmission (T) is calculated by using the Fisher–Lee relationship. Consequently, the thermal and electrical transport properties such as I − V curves, quantum noise (S), Fano factor (F), electrical conductance (G), thermal conductance ( κ ), Seebeck coefficient (Q), and merit number ( Z T ) are calculated. The available results offer the possibility of designing molecular devices, where the change in conductance or current induced by a stereoelectronic effect on the molecular junctions (within the aromatic system) can produce changes on the insulating–conductive states.

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Superconductivity and phase stability of potassium-doped p-quinquephenyl

Cited by 28 publications

References 57 publications

Potassium-Doped Para-Terphenyl: Structure, Electrical Transport Properties and Possible Signatures of a Superconducting Transition

Potassium-Doped Para-Terphenyl: Structure, Electrical Transport Properties and Possible Signatures of a Superconducting Transition

Superconductivity of light‐metal hydrides

Thermo-Electrical Conduction of the 2,7-Di([1,1′-Biphenyl]-4-yl)-9H-Fluorene Molecular System: Coupling between Benzene Rings and Stereoelectronic Effects

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