Volume 48, Number 3, November I 1999
|Page(s)||320 - 325|
|Section||Condensed matter: electronic structure, electrical, magnetic and optical properties|
|Published online||01 September 2002|
Electron doping in the honeycomb bilayer superconductors (Zr, Hf)NCl
Department of Physics, University of California - Davis CA, 95616 USA
2 Departamento de Física, CNEA - Avenida General Paz y Constituyentes 1650 - San Martín, Argentina
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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