Three-Dimensional MgB2-Type Superconductivity in Hole-Doped Diamond

Lilia Boeri, Jens Kortus, and O. K. Andersen
Phys. Rev. Lett. 93, 237002 – Published 30 November 2004

Abstract

We substantiate by numerical and analytical calculations that the recently discovered superconductivity below 4 K in 3% boron-doped diamond is caused by electron-phonon coupling of the same type as in MgB2, albeit in three dimensions. Holes at the top of the zone-centered, degenerate σ-bonding valence-band couple strongly to the optical bond-stretching modes. The increase from two to three dimensions reduces the mode softening crucial for Tc reaching 40 K in MgB2. Even if diamond had the same bare coupling constant as MgB2, which could be achieved with 10% doping, Tc would be only 25 K. Superconductivity above 1 K in Si (Ge) requires hole doping beyond 5% (10%).

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  • Received 19 April 2004

DOI:https://doi.org/10.1103/PhysRevLett.93.237002

©2004 American Physical Society

Authors & Affiliations

Lilia Boeri1,2, Jens Kortus2, and O. K. Andersen2

  • 1INFM SMC and Dipartimento di Fisica, Università la Sapienza, Piazzale Aldo Moro 2, 00185 Roma, Italy
  • 2Max-Planck Institut für Festkörperforschung, Heisenbergstrasse 1, D-70569 Stuttgart, Germany

See Also

Superconductivity in Boron-Doped Diamond

K.-W. Lee and W. E. Pickett
Phys. Rev. Lett. 93, 237003 (2004)

Role of the Dopant in the Superconductivity of Diamond

X. Blase, Ch. Adessi, and D. Connétable
Phys. Rev. Lett. 93, 237004 (2004)

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Vol. 93, Iss. 23 — 3 December 2004

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