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Path for Room-Temperature Superconductivity in Q-Carbon Related Materials
Version 1
: Received: 19 June 2023 / Approved: 20 June 2023 / Online: 20 June 2023 (04:43:37 CEST)
Version 2 : Received: 27 October 2023 / Approved: 30 October 2023 / Online: 30 October 2023 (09:01:40 CET)
Version 2 : Received: 27 October 2023 / Approved: 30 October 2023 / Online: 30 October 2023 (09:01:40 CET)
A peer-reviewed article of this Preprint also exists.
Narayan, J. Path for Room-Temperature Superconductivity in Q-Carbon-Related Materials. C 2024, 10, 14. Narayan, J. Path for Room-Temperature Superconductivity in Q-Carbon-Related Materials. C 2024, 10, 14.
Abstract
We present atomic structures and nonequilbrium synthesis of new class of materials, where the basic structural unit is a diamond tetrahedron. When units of one, two, and three tetrahedra are randomly packed, we create distinct phases of amorphous Q-carbon. Four tetrahedra in two adjacent layers lead to crystalline diamond lattice, which has four missing tetrahedra alternately. When these four missing tetrahedra are filled, we create subunit cell of crystalline Q-diamond. Theoretical calculations show that superconducting transition temperature (Tc) in 50 atomic % B-doped Q-diamond can reach near room temperature at ambient pressures. This is consistent with our earlier results using low-loss EELS measurements in 50 atomic % B-doped Q-carbon, which had mostly amorphous QB3 phase mixed with some crystalline Q-diamond phase. These EELS results showed that the Tc for these samples was in between 90K and 300K. Theoretical calculations of density of states, Eliashberg function, electron-phonon interaction parameter, and root-mean-square and logarithmic average of frequency in crystalline Q-diamond show Tc in the range of 268K to 300K, which is in a complete agreement with our EELS results in QB3.
Keywords
BCS superconductivity; RT superconductivity; B-doped Q-carbon; B-doped diamond
Subject
Engineering, Other
Copyright: This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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