Fermi surface of the superconductor BaIr₂P₂

"Fermi surface of the superconductor BaIr₂P₂", T. Förster, B. Bergk, O. Ignatchik, M. Bartkowiak, S. Blackburn, M. Côté, G. Seyfarth, N. Berry, Z. Fisk, I. Sheikin, A.D. Bianchi, and J. Wosnitza, Phys. Rev. B 92, 134518 (2015).

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We report on de Haas–van Alphen (dHvA) and band-structure studies of the iridium-pnictide superconductor BaIr₂P₂ (Tc=2.1 K). The observed dHvA frequencies can be well understood by our band-structure calculations with two bands crossing the Fermi energy leading to a strongly corrugated Fermi-surface cylinder around the X point and a highly evolved, multiconnected Fermi surface extending over the whole Brillouin zone. The experimental effective masses are found to be considerably larger than the calculated band masses suggesting strong many-body interactions. Nevertheless, T_c remains only moderate in BaIr₂P₂ contrary to isostructural iron pnictides which probably is related to the largely different Fermi-surface topologies in these materials.

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