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Phonon-mediated high-T c superconductivity in hole-doped diamond-like crystalline hydrocarbon

Journal Article · · Scientific Reports
 [1];  [2];  [3];  [4]
  1. Chinese Academy of Sciences (CAS), Beijing (China). Inst. of Physics. Beijing National Lab. for Condensed Matter Physics (BNLCP-CAS); Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing, China.
  2. Chinese Academy of Sciences (CAS), Beijing (China). Inst. of Physics. Beijing National Lab. for Condensed Matter Physics (BNLCP-CAS); Univ. of Chinese Academy of Sciences, Beijing (China). School of Physics
  3. Tsinghua Univ., Beijing (China). Dept. of Physics and State Key Lab. of Low-Dimensional Quantum Physics
  4. Univ. of Nevada, Las Vegas, NV (United States). Dept. of Physics and High Pressure Science and Engineering Center
We here predict by ab initio calculations phonon-mediated high-T c superconductivity in hole-doped diamond-like cubic crystalline hydrocarbon K4-CH (space group I21/3). This material possesses three key properties: (i) an all-sp3 covalent carbon framework that produces high-frequency phonon modes, (ii) a steep-rising electronic density of states near the top of the valence band, and (iii) a Fermi level that lies in the σ-band, allowing for a strong coupling with the C-C bond-stretching modes. The simultaneous presence of these properties generates remarkably high superconducting transition temperatures above 80 K at an experimentally accessible hole doping level of only a few percent. These results identify a new extraordinary electron-phonon superconductor and pave the way for further exploration of this novel superconducting covalent metal.
Research Organization:
Board of Regents Nevada System of Higher Education, Las Vegas, NV (United States)
Sponsoring Organization:
Chinese Academy of Sciences; National Natural Science Foundation of China (NNSFC); USDOE National Nuclear Security Administration (NNSA)
Grant/Contract Number:
NA0001982
OSTI ID:
1368349
Journal Information:
Scientific Reports, Journal Name: Scientific Reports Journal Issue: 1 Vol. 7; ISSN 2045-2322
Publisher:
Nature Publishing GroupCopyright Statement
Country of Publication:
United States
Language:
English

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Cited By (2)

Unusual sulfur isotope effect and extremely high critical temperature in H3S superconductor journal April 2018
Chemistry through cocrystals: pressure-induced polymerization of C 2 H 2 ·C 6 H 6 to an extended crystalline hydrocarbon journal January 2018

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