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Unconventional pairing in doped band insulators on a honeycomb lattice: the role of the disconnected Fermi surface and a possible application to superconducting β-MNCl (M=Hf, Zr)

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Author(s): Kazuhiko Kuroki

Journal: Science and Technology of Advanced Materials
ISSN 1468-6996

Volume: 9;
Issue: 4;
Start page: 044202;
Date: 2008;
Original page

Keywords: β-MNCl | superconductivity | band insulator | Fermi surface | spin fluctuations | pnictides

ABSTRACT
We investigate the possibility of realizing unconventional superconductivity in doped band insulators on the square and honeycomb lattices. The latter lattice is found to be a good candidate due to the disconnectivity of the Fermi surface. We propose applying the theory to the superconductivity in doped layered nitride β-MNCl (M= Hf, Zr). Finally, we compare two groups of superconductors with disconnected Fermi surface, β-MNCl and the iron pnictides, which have high critical temperature Tc, despite some faults against superconductivity are present.
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