| Issue |
Europhys. Lett.
Volume 48, Number 3, November I 1999
|
|
|---|---|---|
| Page(s) | 320 - 325 | |
| Section | Condensed matter: electronic structure, electrical, magnetic and optical properties | |
| DOI | https://doi.org/10.1209/epl/i1999-00484-4 | |
| Published online | 01 September 2002 | |
Electron doping in the honeycomb bilayer superconductors (Zr, Hf)NCl
1
Department of Physics, University of California - Davis CA, 95616 USA
2
Departamento de Física, CNEA - Avenida General Paz y Constituyentes 1650 - San Martín, Argentina
Received:
24
March
1999
Accepted:
8
September
1999
Based on a virtual crystal treatment, we show that alkali doping
introduces electron carriers into a single light mass
(
), low density of states band in LixZrNCl
and NaxHfNCl (which have superconducting Tc up to 25 K)
that is a symmetric interlayer combination
of 
character.
Doping leads to simple K-centered three-fold symmetrical
cylindrical Fermi surfaces
that concentrate low-energy scattering into distinct regions of momentum.
The lack of any observed magnetic tendencies, together with our
calculation of
small electron-phonon strength, suggests a pairing mechanism
that is distinct from known superconductors.
PACS: 74.70.Ad – Metals; alloys and binary compounds (including A15, Laves phases, etc.) / 74.25.Jb – Electronic structure / 74.25.Kc – Phonons
© EDP Sciences, 1999
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